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

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Post by Tomer Eiges on March 28, 2012

if you use the formula for sum
a1(r^n-1) over r-1
it does make since for r=1!
you apply l'hoptial and it comes out to
q = 1

a1*n - which makes sense!

Geometric Series

  • There are 2 formulas for the sum. Use one if you are given n. Use the other if you are given an. In both cases, you will be given the values of r and a1.

  • To find a particular term of a series, say the 4th term, you first need to find the first term using the formula for Sn. Then multiply the first term by r3, using the formula for the nth term of a series, an = a1rn-1.

Geometric Series

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
  • What are Geometric Series? 0:20
    • Example: Common Ratio
  • Sum of Geometric Series 2:27
    • Example
  • Sigma Notation 4:56
    • Example: Index
    • Example
  • Another Sum Formula 7:51
  • Specific Terms 9:19
  • Lecture Example 1 11:15
  • Lecture Example 2 14:30
  • Additional Example 3
  • Additional Example 4