Question

Здравствуйте,помогите пожалуйста 32.10 номер 1.2.3 пример

Answer 1

1) a(a-2b)-(3b+a)^2=

a^2-2ab-(9b^2+6ab+a^2)=

a^2-2ab-9b^2-6ab-a^2=

-8ab-9b^2

2) (m+8)^2-(m-2n)(m+2n)=

m^2+16m+64-(m^2-4n^2)=

m^2+16m+64-m^2+4n^2=

16m+64+4n^2

3)3(b-10)^2+8b-5b^2=

3(b^2-20b+100)+8b-5b^2=

3b^2-60b+300+8b-5b^2=

-2b^2-52b+300=

-b^2-26b+150=

b^2+26b-150.