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OpenStudy (anonymous):
Write the explicit formula for the geometric sequence. a1 = -5 a2 = 20 a3 = -80
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OpenStudy (anonymous):
What's the general formula for a geometric sequence?
OpenStudy (anonymous):
sorry i dont really know
OpenStudy (anonymous):
well each term is multiplied by -4 if that helps I can't recall the general formula. Let me see if I have it in my book here.
OpenStudy (anonymous):
The formula is ar^(n-1). Your a=(-5) and your r=-4.
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