# 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.