Question

How do I simplify (-13b-2b^3+9)-(-11b+7b^3+b^2)

Answer 1

$(-13b-2b^3+9)-(-11b+7b^3+b^2)\\\\=-13b-2b^3+9-(-11b)-7b^3-b^2\\\\=-13b-2b^3+9+11b-7b^3-b^2\qquad\text{combine like terms}\\\\=(-2b^3-7b^3)-b^2+(-13b+11b)+9\\\\=\boxed{-9b^3-b^2-2b+9}$