Aptitude Question ID : 93815

If 5^{5x+5} = 1, then x equals to :
[A]0
[B]1
[C]-1
[D]-\frac{4}{5}

-1
Given that,
5^{5x+5} = 1
=> 5^{5x}\times 5^{5} = 1
=> 5^{5x} = \frac{1}{5^{5}}
=> 5^{5x} = 5^{-5}
=> 5x = -5
=> x = -1
Hence option [C] is the right answer.

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