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Any help? I'm stuck. Find the next three terms in the geometric sequence and write the explicit function used to find the "nth" term. -1, 1, -1, 1, ...

Any help? I'm stuck. Find the next three terms in the geometric sequence and write-example-1

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the common ratio, r = 1 / -1 = -1

First term, a = -1


\begin{gathered} U_n=ar^(n-1) \\ \Rightarrow U_n=(-1)(-1)^(n-1)=(-1)^(n-1+1) \\ \Rightarrow U_n=(-1)^n \end{gathered}
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