anonymous
  • anonymous
What is the sum of the first seven terms of the geometric series where a1 = 10 and r =-2? Answers: s7 = 640 s7 = -430 s7 = 430 s7 = -213
Mathematics
  • Stacey Warren - Expert brainly.com
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chestercat
  • chestercat
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Nerdsarecool
  • Nerdsarecool
What do we know about this question
Nerdsarecool
  • Nerdsarecool
We have to understand it to answer it
mathmale
  • mathmale
Can you identify the first term? The common ratio is r=-2. This means that each succeeding term is found from the previous term by multiplying the previous term by -2. There is a formula for the sum of an infinite geometric series. It looks like this:\[\frac{ a }{1-r }\] but that's ONLY for a series that goes on and on. What if you're interested only in the first 7 terms? There's a formula for that also. Can you find it? (Look up "sum of n first terms of a geometric series."

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anonymous
  • anonymous
We know the ratio and the first part of the equation a1 which is 10
anonymous
  • anonymous
the ratio is -2
mathmale
  • mathmale
@ Snufflebug02: Look up the following: http://www.purplemath.com/modules/series5.htm
mathmale
  • mathmale
@Snufflebug02 Please use the Internet link provided above.

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