Упростите (a+b)(a-b)-a^2+b^2+3ab-6a

Question

Упростите
(a+b)(a-b)-a^2+b^2+3ab-6a

Answer 1

(a+b)(a-b) - a^2 + b^2 + 3ab - 6a =
= a^2 - b^2 - a^2 + b^2 + 3ab - 6a = 3ab - 6a

Answer 2

A^2-b^2-a^2+b^2+3ab-6a=3ab-6a