(2а+6b)²-24ab Помогите плиз

Question

(2а+6b)²-24ab
Помогите плиз

Answer 1

(2а+6b)^2 - 24ab = (2a+6b)(2a+6b) - 24ab = 4a^2 + 24ab + 36b^2 - 24ab = 4a^2 + 36b^2.

Answer 2

4а²+24ab+36b²-24ab=4a²+36b²