Question

Помогите пожалуйста
1. -(u-5)^3 -2(u-3) (u-1)
2. -(y-1)y-(y-3) (y+3)
3. 2(b+2) (b+3)-(b-1)^3

Answer 1

$-(u-5)^3 -2(u-3) (u-1) =-(u^3-125)-2(u^2-4u+3)=$$-u^3+125-2u^2+8u-6=-u^3+119-2u^2+8u$

$2(b+2) (b+3)-(b-1)^3=2(b^2+5b+6)-b^3+1=-b^3+2b^2+10b+13$