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Question

Add the Given Polynomial.
$$x^{3} - 2x^{2} - 9 ; 5x^{3} + 2x + 9 $$

Solution
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$$(x^{3} - 2x^{3} - 9) + (5x^{3} + 2x + 9)$$
$$=x^{3} + 5x^3 - 2x^{2} + 2x - 9 + 9 $$
$$=6x^{3} - 2x^{2} + 2x$$

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