Question

5x$\frac{5x^{2} -5y ^{2}}{(5x-5y) ^{2} }$

Answer 1

$\frac{5x^2-5y^2}{(5x-5y)^2}=\frac{(5x-5y)(5x+5y)}{(5x-5y)(5x-5y)}= \frac{5x+5y}{5x-5y}$