Simplify $(- 4 x^{2} - 2 x y + 9 y^{2}) - (3 x^{2} - 3 x y + 7 y^{2})$

-7x⁴ + x²y² + 2y⁴

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-7x² + xy + 2y²

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15x²y² + xy

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7x² – 5xy + 16y²

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Solution

The correct option is B
-7x² + xy + 2y²

$(- 4 x^{2} - 2 x y + 9 y^{2}) + (- 3 x^{2} + 3 x y - 7 y^{2}) = - 7 x^{2} + x y + 2 y^{2}$

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4 x^{2} - 3 x y - 9 y^{2}

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