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

[M7MBA]

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