Question

упростите выражение 1) a(a+2b)-(b+а)^2 3) 3 (b-1)^2+8b

Answer 1

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

Answer 2

3) 3(b-1)^2+8b=3(b^2-2b-1)+8b=3b^2-6b-3+8b=3b^2+2b-3