Problem

Write an explicit formula that represents the sequence defined by the following recursive formula:
\[
a_{1}=1 \text { and } a_{n}=-2 a_{n-1}
\]
Answer: \( a_{n}= \)
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Answer

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Answer

\(a_n = (-2)^{n-1}\)

Steps

Step 1 :\(a_1 = 1\)

Step 2 :\(a_2 = -2a_1 = -2\)

Step 3 :\(a_n = (-2)^{n-1}\)

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