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

User David Basalla
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(-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}

User Ute
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