Question

a^2-9b^2/ a^2-ab: a^2+3ab/ a-b

Answer 1

$frac{(a-3b)(a+3b)}{a(a-b)}:frac{a(a+3b)}{a-b}=frac{(a-3b)(a+3b)}{a(a-b)}*frac{a-b}{a(a+3b)}=frac{a-3b}{a^2}$