Question

(x-3)(x+3)/x+1-x^2/x+1

Answer 1

$frac{(x-3)(x+3)}{x+1}-frac{x^2}{x+1}=frac{x^2-9-x^2}{x+1}=-frac{9}{x+1}$

Answer 2

(x²-9)/(x+1)-x²/(x+1)=(x²-9-x²)/(x+1)=-9/(x+1)