Упростите:a(a+3b)-(a-3b)^2

Question

Упростите:a(a+3b)-(a-3b)^2

Answer 1

A^2 + 3ab - (a^2 - 6ab + 9b^2) = a^2 + 3ab - a^2 + 6ab - 9b^2=
= 9ab - 9b^2 = 9b (a - b)

Comments

спасибо