Question

(2a+6b)(6b-2a)-(2a+6b)^2

Answer 1

= (36b^2 - 4a^2) - (4a^2 + 36b^2 + 24ab) = 36b^2 - 4a^2 - 4a^2 - 36b^2 - 24ab = -8a^2 - 24ab = -8a (a + 3b)
:)))))

Answer 2

уверен?

Answer 3

Я уверена)