how to prove this

$\displaystyle 5^{2n}-3^n$ when $\displaystyle n\geq0$

i do the base step of proving it works for 0

$\displaystyle 5^{2(0)}-3^0$

$\displaystyle =0$ and $\displaystyle 0\times11=0$ zero is a multiple of 11

so assume $\displaystyle 5^{2n}-3^n$ now the inductive step using n+1. Where do i start?