# Algebra 1 Variables and Expressions

Section 1: Basic Concepts: Lecture 1 | 11:22 min

In this first Algebra I lecture on Educator.com, Dr. Carleen Eaton will briefly cover the history of algebra, the origin of the word 'algebra' and why it is so powerful compared to arithmetic in solving real world problems. You will then cover basic definitions such as variable, algebraic expression, and operations. The lecture concludes with four examples where you will convert an algebraic expression from a sentence.

Dr. Carleen Eaton

Variables and Expressions

Slide Duration:Table of Contents

11m 22s

- Intro0:00
- History of Algebra0:12
- Origin of Word0:21
- Real World Problems0:35
- Definitions0:58
- Variable1:03
- Algebraic Expression1:37
- Operations2:02
- Example 1: Words into Expressions3:02
- Example 2: Words into Expressions5:20
- Example 3: Words into Expressions6:45
- Example 4: Words into Expressions9:46

15m 59s

- Intro0:00
- Example0:17
- Definition0:57
- Procedure to Evaluate an Arithmetic Expression1:08
- Grouping Symbols (Parentheses, Brackets, Braces)1:19
- Powers1:42
- Multiply/Divide Left to Right1:57
- Add/Subtract Left to Right2:21
- Example: Fraction Bar2:49
- Example 1: Evaluate Arithmetic Expression3:45
- Example 2: Evaluate Arithmetic Expression7:28
- Example 3: Evaluate Arithmetic Expression10:11
- Example 4: Evaluate with Variables13:12

9m 50s

- Intro0:00
- Distributive Property Statements0:23
- Moving Forward0:49
- Rule for Subtraction1:14
- Reverse Order1:40
- Several Numbers2:17
- Example 1: Evaluate Using Distributive Property2:56
- Example 2: Multiply Using Distributive Property4:10
- Example 3: Simplify Using Distributive Property4:59
- Example 4: Simplify Using Distributive Property7:03

17m 58s

- Intro0:00
- Real Number System0:31
- Natural Numbers0:39
- Whole Numbers1:11
- Integers1:23
- Rational Numbers1:52
- Cannot Divide by Zero2:18
- Decimals2:27
- Example: Terminating or Repeating2:39
- Real Number System, Cont.3:37
- Square Roots3:42
- Examples3:54
- Irrational Numbers4:36
- Examples5:02
- Perfect Square5:54
- Real Number System, Cont.6:49
- Example: Number Line7:02
- Example 1: Which Set of Numbers7:54
- Example 2: Graph on Number Line10:04
- Example 3: Approximate Irrational Number12:47
- Example 4: Order Largest to Smallest13:57

34m 39s

- Intro0:00
- Functions0:15
- Example: Function0:29
- Example: Not Functions (Relations)1:15
- Graphs4:44
- Visual Display4:53
- Example: X and Y5:03
- Coordinate Pairs5:53
- Discrete Function8:19
- Continuous Function8:55
- Vertical Line Test10:55
- Test if Function11:12
- Example: Pass Through Points11:43
- Domain and Range14:13
- Example14:43
- Example 1: Function Given by Table16:24
- Example 2: Cost of Gas18:46
- Example 3: Cost of Gas23:15
- Example 4: Cost of Mail29:07

16m 5s

- Intro0:00
- Real World Applications0:18
- Strategy0:26
- Using Variables0:32
- Translate Phrases0:48
- Identity Equality Words1:07
- Example 1: Write Equation1:32
- Example 2: Write Equation4:14
- Example 3: Sisters' Ages8:26
- Example 4: Surface Area of Cylinder12:52

15m 24s

- Intro0:00
- Techniques0:21
- Addition Principle0:24
- Example0:37
- Subtraction Principle1:44
- Example1:48
- Strategy2:33
- Isolate the Variable2:41
- Example2:55
- Example 1: Solve Equation3:39
- Example 2: Solve Equation5:38
- Example 3: Word Problem7:38
- Example 4: Word Problem11:14

15m 41s

- Intro0:00
- Isolating the Variable0:08
- Techniques0:34
- Multiplication Principle0:41
- Example0:57
- Division Principle2:32
- Example2:47
- Strategy3:12
- Example3:30
- Opposite Operation3:53
- Example 1: Solve Equation5:07
- Example 2: Solve Equation6:50
- Example 3: Solve Equation10:05
- Example 4: Word Problem12:07

14m 31s

- Intro0:00
- What are Multistep Equations0:06
- Addition/Subtraction and Multiplication/Division0:31
- Strategy0:43
- Identify Last Operation0:47
- Example 1: Solve Equation1:51
- Example 2: Solve Equation5:27
- Example 3: Find Numbers7:39
- Example 4: Solve Equation11:27

20m 17s

- Intro0:00
- Solving More Complicated Equations0:28
- Distributive Property0:41
- Review of Distributive Property0:55
- Factoring1:28
- Subtracting1:50
- Applying with Addition/Subtraction2:08
- Possible Outcomes2:45
- Exactly One Solution2:52
- No Solution3:08
- True for All Real Numbers4:45
- Identities5:01
- Example 1: Solve Equation6:03
- Example 2: Solve Equation9:08
- Example 3: Solve Equation14:06
- Example 4: Solve Equation17:28

16m 5s

- Intro0:00
- Definitions0:07
- Ratio0:10
- Different Representations0:14
- Proportion0:33
- Example0:40
- Cross Product1:08
- Cross Multiplication1:32
- Example2:13
- Rates3:33
- Rates in Real Life3:46
- Example 1: Form a Proportion4:43
- Example 2: Cross Multiply7:15
- Example 3: How Long to Drive9:00
- Example 4: Cross Products12:13

13m 46s

- Intro0:00
- Definitions0:15
- Percent of Increase0:27
- Percent of Decrease0:34
- Examples0:42
- Sales Tax1:48
- Discount2:44
- Example 1: Temperature Change3:12
- Example 2: Sales Tax5:44
- Example 3: Clothing Discount7:04
- Example 4: Sales and Discount9:15

20m 38s

- Intro0:00
- More Than One Variable0:21
- Real Life Examples0:30
- Strategy1:08
- Possible Techniques1:17
- Typical Application1:43
- Solving for a Different Variable1:59
- Example 1: Solve for Y5:06
- Example 2: Solve for Q7:38
- Example 3: Solve for H12:56
- Example 4: Solve for X16:04

16m 58s

- Intro0:00
- Definition0:04
- Relation0:06
- Table0:18
- Set of Ordered Pairs1:01
- Graph1:38
- Domain and Range2:40
- Example: Relation2:51
- Example: Broader Cases3:48
- Inverse of a Relation4:42
- Example4:59
- Example 1: Relation as Table/Graph6:15
- Example 2: Domain and Range8:41
- Example 3: Table, Graph, Domain, Range10:36
- Example 4: Inverse of a Relation13:36

19m 27s

- Intro0:00
- Definition0:14
- Review of Relations0:27
- Violation of Function1:43
- Example: Function2:00
- Vertical Line Test3:18
- Example3:41
- Function Notation6:15
- Using f(x)6:26
- Example: Value Assigned7:12
- Example 1: Relation a Function8:10
- Example 2: Relation a Function9:39
- Example 3: Using f(x) Notation12:20
- Example 4: g(x) Notation15:01

20m 15s

- Intro0:00
- Definition0:07
- Standard Form0:18
- Example0:52
- Graph and Intercepts2:39
- Example: Graph2:48
- X-Intercept2:56
- Y-Intercept3:35
- Graphing Linear Equations4:29
- Example4:47
- Linear Functions7:51
- Example8:15
- Example 1: Linear10:16
- Example 2: Linear Equation12:58
- Example 3: Intercepts14:23
- Example 4: Equation from Intercepts16:47

19m 46s

- Intro0:00
- Rate of Change0:06
- Other Words0:14
- Example0:24
- Slope2:12
- Two Points2:39
- Steepness of a Line2:57
- Possible Slopes4:29
- Positive Slope5:02
- Negative Slope5:29
- Zero Slope (Horizontal Line)6:23
- Undefined Slope (Vertical Line)7:08
- Example 1: Rate of Change of Table8:19
- Example 2: Slope Through Points10:52
- Example 3: Increasing/Decreasing13:06
- Example 4: Slope Through Points16:02

13m 54s

- Intro0:00
- Definitions0:10
- Constant of Variation k0:21
- Example: Gas and Miles Driven0:59
- Graph1:50
- k is Slope2:04
- Examples2:27
- Applications2:47
- Write, Graph, Solve2:58
- Example 1: Constant of Variation3:11
- Example 2: Graph Direct Variation4:59
- Example 3: Direct Variation6:50
- Example 4: Distance Car Travels9:18

12m 6s

- Intro0:00
- Slope Intercept Form0:12
- m (Slope) and b (Y Intercept)0:31
- Example1:12
- Example 1: Slope Intercept Form Equation2:39
- Example 2: Graph the Equation5:11
- Example 3: Slope Intercept Form Equation6:51
- Example 4: Slope Intercept Form Equation8:50

9m 7s

- Intro0:00
- Point Slope Form0:07
- Manipulating to Other Forms0:35
- m (Slope), x1 y1 (Point)0:47
- Example 1: Point Slope Form Equation1:03
- Example 2: Point Slope Form Equation2:50
- Example 3: Point Slope Form Equation4:18
- Example 4: Point Slope Form Equation6:50

18m 2s

- Intro0:00
- Parallel Lines0:08
- Example0:15
- Vertical Lines0:40
- Perpendicular Lines1:19
- Negative Reciprocal1:31
- Example2:05
- Example 1: Slope Intercept Form3:25
- Example 2: Parallel or Perpendicular6:15
- Example 3: Slope Intercept Form9:27
- Example 4: Slope Intercept Form12:35

22m 45s

- Intro0:00
- Systems of Equations0:10
- Definition0:15
- Example0:31
- Solution0:47
- Solving by Graphing1:23
- Points of Intersection1:36
- Example1:56
- Number of Solutions3:09
- Independent3:20
- Dependent3:50
- Inconsistent4:46
- Example 1: Solve by Graphing5:45
- Example 2: Solve by Graphing9:50
- Example 3: Solve by Graphing14:17
- Example 4: Solve by Graphing18:03

22m 41s

- Intro0:00
- Substitution0:09
- Example0:45
- Number of Solutions2:47
- Infinite Solutions3:11
- No Solutions4:28
- Example 1: Solve by Substitution5:44
- Example 2: Solve by Substitution10:01
- Example 3: Solve by Substitution15:17
- Example 4: Solve by Substitution19:41

16m 13s

- Intro0:00
- Fundamental Principle0:10
- Example0:23
- Example 1: Solve the System1:52
- Example 2: Solve the System5:53
- Example 3: Solve the System10:15
- Example 4: Solve the System14:08

11m 34s

- Intro0:00
- Fundamental Principle0:09
- Example0:36
- Solutions of Inequalities1:51
- Inequality1:59
- Set Builder Notation2:02
- Graph on a Number Line2:08
- Examples2:18
- Example 1: Solve the Inequality4:59
- Example 2: Solve the Inequality7:00
- Example 3: Solve the Inequality8:10
- Example 4: Solve the Inequality9:47

10m 49s

- Intro0:00
- Fundamental Principle0:10
- Only Positive Numbers0:23
- Example0:51
- Fundamental Principle, Cont.2:01
- Negative Numbers2:12
- Reverse Inequality Sign2:28
- Example2:48
- Example 1: Solve the Inequality4:26
- Example 2: Solve the Inequality5:45
- Example 3: Solve the Inequality6:50
- Example 4: Solve the Inequality8:28

16m 56s

- Intro0:00
- Similarity to Multistep Equations0:16
- Negative Numbers0:32
- Example0:49
- Inequalities Containing Grouping Symbols1:24
- Example1:35
- Special Cases2:45
- Example: All Real Numbers3:04
- Example: Empty Set4:10
- Example 1: Solve the Inequality6:05
- Example 2: Solve the Inequality7:39
- Example 3: Solve the Inequality9:57
- Example 4: Solve the Inequality13:56

21m 32s

- Intro0:00
- What is a Compound Inequality0:07
- Joined by 'And' or 'Or'0:16
- Inequalities Combined by 'And'0:36
- Intersection/Overlap0:53
- Example1:08
- Inequalities Combined by 'Or'4:23
- Union4:41
- Example5:27
- Example 1: Solve the Inequality6:39
- Example 2: Solve the Inequality11:30
- Example 3: Solve the Inequality13:43
- Example 4: Solve the Inequality18:19

24m 16s

- Intro0:00
- Absolute Value0:06
- Number Line0:22
- Example0:41
- Absolute Value is N1:52
- Absolute Value Function3:17
- Example3:40
- g(x) and f(x)4:31
- Solving Absolute Value Equations6:23
- Absolute Value in Words6:39
- Split Into Two Parts7:58
- Solve Both Equations8:22
- Example 1: Solve the Absolute Value10:34
- Example 2: Solve the Absolute Value13:09
- Example 3: Solve the Absolute Value14:52
- Example 4: Solve the Absolute Value20:23

17m 37s

- Intro0:00
- Inequalities of the Form |x|< n0:07
- Values that Satisfy Both Inequalities0:46
- Example1:27
- Inequalities of the Form |x|> n3:58
- Values that Satisfy Either Inequalities4:19
- Example4:47
- Example 1: Solve the Inequality6:38
- Example 2: Solve the Inequality9:54
- Example 3: Solve the Inequality12:05
- Example 4: Solve the Inequality14:50

24m 33s

- Intro0:00
- Graph0:08
- Half Plane and Boundary0:51
- Technique for Graphing1:57
- Graph Equation2:01
- Solid Line or Dashed Line2:07
- Example2:32
- Choosing a Test Point5:10
- Example5:26
- Example 1: Solve the Inequality7:49
- Example 2: Solve the Inequality11:37
- Example 3: Solve the Inequality15:44
- Example 4: Solve the Inequality19:10

24m 4s

- Intro0:00
- System of Inequalities0:05
- Example0:22
- Solving a System of Inequalities0:38
- Solution Set0:46
- Graph Each Inequality0:57
- Area of Overlap1:45
- Example 1: Solve the System of Inequalities2:44
- Example 2: Solve the System of Inequalities6:33
- Example 3: Solve the System of Inequalities11:40
- Example 4: Solve the System of Inequalities17:36

22m 19s

- Intro0:00
- What is a Monomial0:09
- Examples0:17
- Power0:55
- Base and Exponent1:52
- Properties of Exponents2:16
- Add Exponents2:25
- Multiply Exponents4:00
- Product Exponent4:39
- Simplified Form7:26
- Examples7:47
- Example 1: Simplify the Monomial8:26
- Example 2: Simplify the Monomial10:32
- Example 3: Simplify the Monomial12:48
- Example 4: Simplify the Monomial17:33

24m 2s

- Intro0:00
- Properties of Exponents0:05
- Dividing with Same Base0:15
- Example0:53
- Quotient Raised to Power2:22
- Example2:53
- Raising to 0 Power4:00
- Example4:21
- Negative Exponents5:45
- Example6:05
- Example 1: Simplify the Monomial7:33
- Example 2: Simplify the Monomial14:56
- Example 3: Simplify the Monomial13:30
- Example 4: Simplify the Monomial17:35

8m 56s

- Intro0:00
- What is a Polynomial0:07
- Monomial0:40
- Binomial1:15
- Trinomial1:25
- Degree of a Polynomial1:56
- Example: Degree of Monomial2:13
- Example: Degree of Polynomial2:47
- Ordering Polynomials3:32
- Example3:47
- Example 1: Trinomial or Binomial4:44
- Example 2: Find the Degree5:27
- Example 3: Increasing Powers6:11
- Example 4: Decreasing Powers7:27

15m 51s

- Intro0:00
- Adding Polynomials0:07
- Like Terms0:18
- Example1:02
- Subtracting Polynomials2:44
- Example2:58
- Example 1: Add Polynomials5:11
- Example 2: Subtract Polynomials7:30
- Example 3: Add and Subtract9:35
- Example 4: Add and Subtract12:09

18m 17s

- Intro0:00
- Distributive Property0:07
- Example0:54
- Solving Equations1:36
- Isolate Variable and Solve1:46
- Example 1: Multiply1:59
- Example 2: Simplify3:33
- Example 3: Simplify7:20
- Example 4: Solve13:37

18m 2s

- Intro0:00
- Distributive Property0:08
- Example0:54
- FOIL Method2:44
- First, Outer, Inner, Last3:20
- Example 1: Multiply5:32
- Example 2: Multiply7:27
- Example 3: Multiply9:41
- Example 4: Multiply13:56

17m

- Intro0:00
- Square of a Sum0:06
- Example1:09
- Square of a Difference2:46
- Example3:22
- Difference of Two Squares4:50
- Example5:31
- Example 1: Multiply6:24
- Example 2: Multiply8:34
- Example 3: Multiply11:03
- Example 4: Multiply12:54

17m 51s

- Intro0:00
- Prime and Composite Numbers0:09
- Prime Number0:12
- Composite Number0:42
- Factored Forms1:39
- Prime Factored Form1:40
- Factored Form2:21
- Greatest Common Factor3:55
- Example: GCF for Number4:19
- Example: GCF for Monomial6:00
- Example 1: Prime Factored Form7:51
- Example 2: Factored Form9:34
- Example 3: GCF11:12
- Example 4: GCF13:28

25m 21s

- Intro0:00
- Distributive Property0:05
- Example: Binomial0:49
- Example: Trinomial2:18
- Factoring by Grouping4:17
- Example: Four Terms4:40
- Zero Product Property8:21
- Example9:01
- Example 1: Factor the Polynomial10:38
- Example 2: Factor the Polynomial13:43
- Example 3: Factor the Polynomial19:59
- Example 4: Solve the Polynomial22:58

27m 11s

- Intro0:00
- Factoring Trinomials0:07
- Leading Coefficient0:11
- Example1:20
- Rules for Signs2:42
- P and Q Both Positive2:55
- P and Q Both Negative3:39
- P and Q Opposite Signs4:30
- Solving Equations5:18
- Example6:44
- Example 1: Factor the Polynomial7:41
- Example 2: Factor the Polynomial12:33
- Example 3: Factor the Polynomial16:39
- Example 4: Solve the Polynomial21:35

46m 9s

- Intro0:00
- Factoring Trinomials0:15
- Example2:42
- Grouping7:20
- Example7:35
- Rules for Signs10:51
- Same as Leading Coefficient is 111:05
- Greatest Common Factor12:29
- Use Whenever Possible12:41
- Example12:59
- Prime Polynomials13:58
- Example14:33
- Solving Equations16:55
- Example17:25
- Example 1: Factor the Polynomial18:46
- Example 2: Factor the Polynomial25:23
- Example 3: Factor the Polynomial32:37
- Example 4: Solve the Polynomial36:18

24m 3s

- Intro0:00
- Difference of Two Squares0:08
- Example0:36
- Factoring Using Several Techniques2:23
- Factoring the GCF2:30
- Example3:22
- Solving Equations5:24
- Example5:50
- Example 1: Factor the Polynomial7:34
- Example 2: Factor the Polynomial9:11
- Example 3: Factor the Polynomial12:00
- Example 4: Solve the Polynomial18:31

18m 10s

- Intro0:00
- Perfect Squares0:07
- Example: Perfect Square Trinomials1:12
- Solving Equations2:57
- Square Root Property3:09
- Example3:28
- Example 1: Factor the Polynomial5:09
- Example 2: Factor the Polynomial6:13
- Example 3: Solve the Polynomial8:43
- Example 4: Solve the Polynomial13:35

35m 45s

- Intro0:00
- Parabolas0:14
- Standard Form of Quadratic Function0:28
- Examples1:05
- Absolute Value of 'a'2:19
- Parabolas That Open Upward3:14
- Minimum3:48
- Example3:57
- Parabolas That Open Downward6:57
- Example7:17
- Maximum9:23
- Vertex9:53
- Example10:40
- Axis of Symmetry14:16
- Example15:03
- Example 1: Graph the Quadratic19:54
- Example 2: Graph the Quadratic24:12
- Example 3: Vertex Maximum or Minimum28:32
- Example 4: Axis of Symmetry31:13

40m 42s

- Intro0:00
- Solving a Quadratic Equation0:08
- Example0:56
- Two Distinct Solutions/Roots8:10
- Roots8:23
- Example: Graphs8:40
- One Double Root9:19
- Example: One X-Intercept9:54
- No Real Roots14:03
- Example14:53
- Estimating Solutions18:41
- Example: Not Integers19:18
- Example 1: Solve by Graphing20:18
- Example 2: Solve by Graphing26:36
- Example 3: Solve by Graphing30:18
- Example 4: Estimate by Graphing34:59

28m 13s

- Intro0:00
- Perfect Square Trinomials0:15
- Example0:36
- Completing the Square4:55
- Example6:20
- Completing the Square to Solve Equations9:19
- Example9:40
- When the Leading Coefficient is Not 113:17
- Example14:01
- Example 1: Solve the Equation15:05
- Example 2: Complete the Square20:16
- Example 3: Solve by Completing the Square22:31
- Example 4: Solve by Completing the Square25:02

17m 17s

- Intro0:00
- Quadratic Formula0:17
- Standard Form0:24
- Example1:00
- Discriminant3:14
- Two Solutions and Both Real3:40
- One Real Solution4:07
- No Real Solutions4:28
- Example 1: Solve the Equation6:25
- Example 2: Solve the Equation8:42
- Example 3: Solve the Equation12:02
- Example 4: Number of Real Roots15:23

41m 30s

- Intro0:00
- Radical Expression0:12
- Example: Radicand Simplest Form0:29
- Example: Not Simplest Form1:16
- Principal Square Root (Positive)2:43
- Product Property3:40
- Examples4:05
- Square Roots of Variables with Even Powers7:01
- Eliminate Radical Sign7:42
- Divide Exponent by 27:57
- Absolute Value of Result8:29
- Examples8:52
- Quotient Rule14:12
- Example14:31
- Rationalizing Denominators16:08
- Example16:43
- Conjugates18:33
- Example19:53
- Simplest Radical Form20:58
- Three Criteria21:10
- Example 1: Simplify Expression21:57
- Example 2: Simplify Expression25:12
- Example 3: Simplify Expression31:37
- Example 4: Simplify Expression35:29

21m 52s

- Intro0:00
- Adding and Subtracting Radical Expressions0:13
- Like Radicals0:28
- Distributive Property1:10
- Multiplying Radical Expressions4:24
- Example: Use FOIL4:44
- Example 1: Simplify Expression7:07
- Example 2: Simplify Expression8:51
- Example 3: Simplify Expression12:14
- Example 4: Simplify Expression16:06

27m

- Intro0:00
- Radical Equations0:15
- Examples0:30
- Solving a Radical Equation1:13
- Isolate Radical1:18
- Square Both Sides1:38
- Example1:44
- Extraneous Solutions2:57
- Example: Check Solutions3:30
- Example 1: Solve Equation6:29
- Example 2: Solve Equation9:52
- Example 3: Solve Equation14:29
- Example 4: Solve Equation20:53

17m 24s

- Intro0:00
- Right Triangles0:06
- Vertex0:32
- Hypotenuse0:56
- Legs1:11
- Pythagorean Theorem1:21
- Graphical Representation1:37
- Example2:39
- Pythagorean Triples3:40
- Example3:56
- Converse of the Pythagorean Theorem4:36
- Example6:23
- Example 1: Length of Hypotenuse7:24
- Example 2: Length of Legs9:02
- Example 3: Area of Triangle12:00
- Example 4: Length of Side14:59

26m 50s

- Intro0:00
- Distance Formula0:09
- Similarity to Pythagorean Theorem0:21
- Missing Coordinates5:50
- Example6:22
- Example 1: Distance Between Points11:43
- Example 2: Distance Between Points14:05
- Example 3: Distance Between Points18:18
- Example 4: Missing Coordinate21:57

24m 13s

- Intro0:00
- Direct Variation0:12
- Inverse Variation0:24
- Constant of Variation k0:50
- Y Varies Inversely as X0:59
- Graphing Inverse Variation3:09
- Real World Applications3:24
- Example3:59
- Product Rule10:19
- Alternate Form11:10
- Finding Missing 4th Point11:24
- Example 1: Graph Inverse Variation11:36
- Example 2: Graph Inverse Variation14:47
- Example 3: Find Missing Point19:39
- Example 4: Find Missing Point21:53

34m 22s

- Intro0:00
- Rational Expressions0:10
- Examples0:28
- Excluded Values1:03
- Dividing by 01:29
- Example2:49
- Simplifying Rational Expressions7:12
- Eliminating the GCF7:17
- Example: Regular Fraction7:30
- Example: Rational Expression8:12
- Simplifying and Excluded Values10:15
- Original Rational Expression10:24
- Example10:47
- Example 1: Find Excluded Values13:47
- Example 2: Simplify and Find Excluded Values16:10
- Example 3: Simplify and Find Excluded Values22:04
- Example 4: Simplify and Find Excluded Values26:29

22m 58s

- Intro0:00
- Procedure0:08
- Examples0:29
- Cancel Before Multiplication1:53
- Example2:04
- Rational Expressions Containing Polynomials3:18
- Example3:46
- Example 1: Multiply Rational Expressions6:04
- Example 2: Multiply Rational Expressions9:11
- Example 3: Multiply Rational Expressions11:19
- Example 4: Multiply Rational Expressions17:36

21m 49s

- Intro0:00
- Procedure0:10
- Reciprocal of Expression0:22
- Example: Regular Fractions0:44
- Example: Rational Expressions1:46
- Cancel Before Multiplying3:23
- Why Cancel3:45
- Example4:15
- Rational Expressions Containing Polynomials6:46
- Example7:06
- Example 1: Divide Rational Expressions9:15
- Example 2: Divide Rational Expressions13:11
- Example 3: Divide Rational Expressions15:39

35m 57s

- Intro0:00
- Dividing a Polynomial by a Monomial0:11
- Example: Regular Fractions0:36
- Example: Polynomials1:24
- Dividing a Polynomial by a Binomial2:56
- Example: Dividend and Divisor3:30
- Long Division5:28
- Example: Regular Numbers5:49
- Example: Polynomials7:17
- Missing Terms12:20
- Definition12:40
- Example12:55
- Example 1: Divide the Polynomials18:42
- Example 2: Divide the Polynomials20:54
- Example 3: Divide the Polynomials23:28
- Example 4: Divide the Polynomials28:52

17m 38s

- Intro0:00
- Adding with Like Denominators0:09
- Example: Regular Numbers0:19
- Example: Rational Expressions1:05
- Subtracting with Like Denominators2:35
- Example: Regular Fractions2:52
- Example: Rational Expressions3:05
- Denominators That Are Additive Inverses4:08
- What Are Additive Inverses4:35
- Example5:53
- Example 1: Add Rational Expressions7:54
- Example 2: Subtract Rational Expressions8:43
- Example 3: Add Rational Expressions10:39
- Example 4: Subtract Rational Expressions11:48

37m 16s

- Intro0:00
- Least Common Multiple of Polynomials0:21
- Example: Regular Fractions0:42
- Example: Rational Expressions5:18
- Equivalent Rational Expressions Using LCM7:23
- Example8:09
- Adding and Subtracting14:24
- Summary of Techniques14:32
- Example 1: Find the LCM15:09
- Example 2: Add Rational Expressions17:53
- Example 3: Subtract Rational Expressions22:19
- Example 4: Add Rational Expressions30:44

25m 38s

- Intro0:00
- Mixed Expressions0:10
- Analogy to Mixed Fractions0:23
- Polynomial and Rational Expression0:59
- Example: Combining1:55
- Converting to Rational Expression2:29
- Complex Fraction5:16
- Examples5:30
- Simplifying Complex Fractions6:08
- Example6:27
- Example 1: Write as Rational Expression9:43
- Example 2: Simplify Complex Fractions12:44
- Example 3: Simplify Complex Fractions15:03
- Example 4: Simplify Complex Fractions19:55

38m 9s

- Intro0:00
- Definition0:11
- Example: Cross Multiplication0:39
- Example: Rational Expressions1:13
- Solving Rational Equations3:12
- Multiply by LCM of Denominators3:33
- Example4:02
- Work Problems7:19
- Example: Complete a Project8:17
- Extraneous Solutions12:41
- Check All Solutions13:18
- Example13:54
- Example 1: Solve Rational Equation17:28
- Example 2: Solve Rational Equation19:45
- Example 3: Work Problem27:15
- Example 4: Solve Rational Equation31:10

For more information, please see full course syllabus of Algebra 1

0 answers

Post by Jerry Yang on August 1 at 10:19:09 AM

The times symbol is also an asterisk (*)

0 answers

Post by Hong Yang on June 4 at 08:52:44 AM

You are SUPER at teaching Algebra.

0 answers

Post by Mohamed E Sowaileh on July 10, 2017

Hello Dr. Carleen Eaton,

I hope you are very well.

I am a student who is extremely weak in math. In order to be very strong in math, specially for engineering field, could you provide me with sequential order of mathematical topics and textbooks. With what should I begin so that I can master big topics like calculus, statistics, probability ... etc.

Your guidance is precious to me.

Thank you so much.

0 answers

Post by Michael Romanov on October 25, 2016

al-gabr closely means completion - "This came from the title of a book, Hidab al-jabr wal-muqubala, written in Baghdad about 825 A.D. by the Arab mathematician Mohammed ibn-Musa al-Khowarizmi."

Just to put it all in one place:

The idea is to balance out or complete something: a shape or equation or expression.

A Variable is a letter or symbol that represents a number or group of numbers.

An Expression is a mathematical phrase that combines numbers and or variables with arithmetic operations. Â

An Equation is a mathematical statement that two Expressions are equal.

That last part is important because if you do not understand arithmetic operations, you will struggle when trying to balance out / complete an expression or equation.

4 answers

Last reply by: Hong Yang

Thu Jun 4, 2020 8:54 AM

Post by Jessie Carrillo on January 24, 2016

Greetings Professor Eaton, I was wondering if the related books on your Algebra 1 and Algebra 2 courses are books you based off the lectures. If yes, do you recommend acquiring those books and working with them in conjuction with your lessons. If not, what book or books do your recommend to get a good handle on Algebra 1 and Algebra 2.

1 answer

Last reply by: Dr Carleen Eaton

Mon May 13, 2013 12:19 AM

Post by Shoshana C on May 11, 2013

How do you know that m and n are equal?

2 answers

Last reply by: Elena Doskalovich

Mon Jun 10, 2013 9:13 AM

Post by Leilani Greenwood on January 5, 2013

Will there be any practice problems?

1 answer

Last reply by: Dr Carleen Eaton

Thu Dec 27, 2012 12:21 AM

Post by Mary Galanopoulos on December 26, 2012

Would you put parenthesis around the m and n?