anonymous
  • anonymous
Write the explicit formula for the geometric sequence. a1 = -5 a2 = 20 a3 = -80
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
A. an = -5 • (-4)n B. an = -5(-4)n-1 C. an = -4(-5)n-1 D. an = -5 • (4)n
tkhunny
  • tkhunny
What say you? Try them out by producing those three values.
anonymous
  • anonymous
I don't really know how to do these. I didn't get much time to study... Could you explain?

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tkhunny
  • tkhunny
Use the value n = 1 in each description. See which produce -5 A. an = -5 • (-4)n a1 = -5*(-4)^1 = -5*-4 = 20 -- That's not -5 B. an = -5(-4)n-1 a1 = -5(-4)^0 = -5*1 = -4 -- Okay, this one is in the running C. an = -4(-5)n-1 a1 - -4(-5)^0 = -4*1 = -4 -- That's not -5 D. an = -5 • (4)n a1 = -5(4)^1 = -6*4 = -20 -- That's not -5 Looks like you need to try "B". What is a2? What is a3? Do we have a complete match?
anonymous
  • anonymous
I'm still not understand.

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