some quadratic equation

How to solve the following equation

5^(2x) - 5^(x+3) + 125 = 5^x

This problem has been given under quadratic.

Any help in this regard solicited.

Thanks.

Arangaswamy

note that

factor 5^x and factor 5^3
or you can let and see what happened

Thank you. I will do that and get back to you.