$(5 x^{2} + 6 x - 3) - (2 x^{2} - 7 x - 9)$

3 x^{2} + 12 x + 6

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3 x^{2} + 13 x + 6

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3 x^{2} + 9 x + 6

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None of the above

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Solution

The correct option is D $3 x^{2} + 13 x + 6$
$5 x^{2} + 6 x - 3$
$2 x^{2} - 7 x - 9$
$- + + - ------------- -$
$3 x^{2} + 13 x + 6$

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