Question

а^7(a-b)^2/ a^4(a-b)^3

Answer 1

$frac{a^7(a-b)^2}{a^4(a-b)^3}= frac{a^3(a^4(a-b)^2)}{(a-b)(a^4(a-b)^2)}= frac{a^3}{a-b}$