Question

Сократите дробь:
$frac{25^n-16^n}{5^n+4^n}$

Answer 1

$= dfrac{5^{2n}-4^{2n}}{5^n+4^n}= dfrac{(5^n-4^n)(5^n+4^n)}{5^n+4^n}=5^n-4^n$