Verified Answer :

itsandypandy

Answer:

\(3x^{3} + 7x^{2} - 8x\)

Step-by-step explanation:

\(p(x) + q(x) - r(x)\)

\((5x^{3} + 3x^{2} - 6x - 4) - (3x^{3} -2x^{2} - x + 3) + (x^{3} + 2x^{2} - 3x + 7)\)

\(5x^{3} + 3x^{2} - 6x - 4 - 3x^{3} + 2x^{2} + x - 3 + x^{3} + 2x^{2} - 3x + 7\)

\(3x^{3} + 7x^{2} - 8x\)

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