Question

(а+2)²-(а+2)(2-а) Хэлп!!!

Answer 1

a^2 + 4a + 4 + (a - 2)(a +2) = 
= a^2 + 4a + 4 + a^2 - 4 = 
= 2a^2 + 4a = 2a(a + 2)

Answer 2

$(a+2)^2-(a+2)(2-a)=(a+2)(a+2-2+a)=2a(a+2).$