Question

equação exponencial

0,2 elevado a x =625

Answer 1

$0,2^x=625\\\\\\\left(\frac{2}{10}\right)^x=625\\\\\\\left(\frac{1}{5}\right)^x=5^4\\\\\\\left(5^{-1}\right)^x=5^4\\\\\\5^{~-1~.~x}=5^4\\\\\\5^{-x}=5^4\\\\\\-x=4\\\\\\\boxed{x=-4}$