Question

Сократите дробь:
(x^2+2х-15)/(x^2-9)

Answer 1

$frac{x^2+2x-15}{x^2-9}= frac{(x-3)(x+5)}{(x-3)(x+3)}= frac{x+5}{x+3}\\x^2+2x-15=(x-3)(x+5)\x_1=3; x_2=-5$