Add $(12 x^{2} + 4 x + 5 y)$ and $(3 x^{2} - 2 x + 3 y)$ .

2 x^{2} - 2 x + 8 y

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2 x^{2} + 15 x + 8 y

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15 x^{2} - 2 x + 8 y

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15 x^{2} + 2 x + 8 y

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Solution

The correct option is D $15 x^{2} + 2 x + 8 y$
Adding $(12 x^{2} + 4 x + 5 y) + (3 x^{2} - 2 x + 3 y)$
$\Rightarrow 12 x^{2} + 4 x + 5 y + 3 x^{2} - 2 x + 3 y$
$\Rightarrow 15 x^{2} + 2 x + 8 y$

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