Question

(3a-9/a+2):(a^2-9/a^2-4)

Answer 1

$frac{3a-9}{a+2} : frac{a^2-9}{a^2-4} = frac{3a-9}{a+2} * frac{a^2-4}{a^2-9} = frac{3(a-3)}{a+2} * frac{(a-2)(a+2)}{(a-3)(a+3)} = frac{3}{1} * frac{(a-2)}{(a+3)} = 3*frac{(a-2)}{(a+3)}$