Question

Factorise:
$\frac{50}{a^2}-\frac{2a^2}{25}$

Answer 1

$\frac{50}{a^2}-\frac{2a^2}{25}=2(\frac{5^2}{a^2}-\frac{a^2}{5^2})=2(\frac{5}{a}-\frac{a}{5})(\frac{5}{a}+\frac{a}{5})$