Question

Упростите выражение: a(a+2b)-(b+a)^2

Answer 1

a^2+2ab-b^2-2ab-a^2 = -b^2

Answer 2

 a(a+2b)-(b+a)^2= а^2+2ab-(b^2+2ab+ a^2)=a^2+2ab-b^2-2ab-a^2=-b^2