Multiply
$(x + 7 y)$ and $(7 x - y)$

7 x^{2} + 48 x y - 7 y^{2}

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7 x^{2} + 48 x y + 7 y^{2}

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7 x^{2} - 48 x y - 7 y^{2}

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- 7 x^{2} - 48 x y + 7 y^{2}

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Solution

The correct option is D $7 x^{2} + 48 x y - 7 y^{2}$
$(x + 7 y) \times (7 x - y)$
$= x (7 x - y) + 7 y (7 x - y)$
$= 7 x^{2} - x y + 49 x y - 7 y^{2}$
$= 7 x^{2} + 48 x y - 7 y^{2}$

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