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3) Find the sum of 6x3 – 5x2 + 7x and -x3 + 7x2-8
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3) Find the sum of 6x3 – 5x2 + 7x and -x3 + 7x2-8

User Vitalii Kotliarenko
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\begin{gathered} (6x^3-5x^2+7x)+(-x^3+7x^2-8)=6x^3-5x^2+7x-x^3+7x^2-8 \\ =5x^3+2x^2+7x-8 \end{gathered}

User David Heffernan
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