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INSTRUCTORS Carleen Eaton Grant Fraser Eric Smith
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For more information, please see full course syllabus of Algebra 1
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Lecture Comments (2)

1 answer

Last reply by: Arpana Duggal
Thu Jul 18, 2013 10:48 AM

Post by Jeff Mitchell on February 1, 2011

He says ~1:30 into the lecture he says "TWICE" the formula is valid if A not equal to 0 and circles the statement that says A not equal to 1. WHICH ONE IS IT?

Solving Equations Using the Quadratic Formula

  • You can use the Quadratic Formula to solve any quadratic equation.

  • If you do not see an easy way to factor a quadratic equation, use the formula.

  • The discriminant is the radicand in the Quadratic Formula. Use it to determine the number of real roots of a particular quadratic equation.

  • If the discriminant is positive, the equation has 2 real roots.

  • If the discriminant is 0, it has one rational root.

  • If the discriminant is negative, it has no real roots.

Solving Equations Using the Quadratic Formula

Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.

  • Intro 0:00
  • Quadratic Formula 1:26
    • Example
  • Discriminant 4:28
    • Two Distinct Real Roots
    • One Double Real Root
    • No Real Root
    • Why Does It Work?
  • Lecture Example 1 7:53
  • Lecture Example 2 11:50
  • Additional Example 3
  • Additional Example 4