$5 x^{3} + 5 x^{2} + 4 x + 3 + 4 x^{2} + 5 x =$

9 x^{3} + 4 x^{2} + 4 x + 5

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5 x^{3} + 5 x^{2} + 9 x + 4

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5 x^{3} + 9 x^{2} + 9 x + 3

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None of the above

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Solution

The correct option is D $5 x^{3} + 9 x^{2} + 9 x + 3$
$5 x^{3} + 5 x^{2} + 4 x + 3 + 4 x^{2} + 5 x$
$= 5 x^{3} + 9 x^{2} + 9 x + 3$

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