Question

What is the equation for a geometric sequence with a first term of 2 and second term of -8?

Answer 1

A(1) = 2
r = a(2)/a(1) = -8/2 = -4

$a(n) =a {(r)}^{n - 1} \\ a(n) = 2 {( - 4)}^{n - 1}$
Answer will be D.

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