If \[{{2}^{x-1}}+{{2}^{x+1}}=\mathbf{640,}\] the value of x is

1.	If \[{{2}^{x-1}}+{{2}^{x+1}}=\mathbf{640,}\] the value of x is
A.	7
B.	8
C.	9
D.	6
Answer» C. 9

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If \[{{2}^{x-1}}+{{2}^{x+1}}=\mathbf{640,}\] the value of x is

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