Question

Write the explicit formula that represents the geometric sequence -2, 8, -32, 128

Answer 1

r=-4 (u mulitply times -4 each time).
\(a_1\)=-2 (that is your first term).
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The general formula for geometirc sequence is: \(a_n\) = \(a_1\) • \(\rm r\)\(^{(n-1)}\)

plug in the common ratio \(\rm r\) and the first term \(a_1\), and there is your answer.

Answer 2

I'm sorry I'm still lost

Answer 3

what exactly do you have a problem with?

Answer 4

so my answer is a=-2*-4 (n-1)

Answer 5

please help