If \(x\) is an integer, is \(9^x+9^{-x}=b?\)

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by M7MBA » Wed Sep 09, 2020 6:47 am

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If \(x\) is an integer, is \(9^x+9^{-x}=b?\)

(1) \(3^x+3^{-x}=\sqrt{b+2}\)

(2) \(x > 0\)

Answer: A

Source: Official Guide

Source: Beat The GMAT — Data Sufficiency | Wed Sep 09, 2020 6:47 am

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