Represent the geometric series using the explicit formula. 2, −8, 32, −128, …

Well, i think its hold on

Explanation:

well,  since we know is a geometric sequence, we can always get the common ratio  of it by simply dividing one value by the one behind it... so let's do so, with say hmm -32 and 8  -32/8 = -4  <-- our common ratio

the first term is -2

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