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

If\[{{\mathbf{2}}^{\mathbf{x-1}}}\mathbf{+}{{\mathbf{2}}^{\mathbf{x+1}

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

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

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