Add the given polynomials
$- x^{3} - 2 x^{2} - 9, 5 x^{3} + 2 x + 9$

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Solution

$- x^{3} - 2 x^{2} - 9$
$5 x^{3}$ $+ 9 + 2 x$
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$4 x^{3} - 2 x^{2} + 0 + 2 x$
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$\Rightarrow 4 x^{3} - 2 x^{2} + 2 x$ .

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