The product of $(x + 7 y) a n d (7 x - y)$ is

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Solution

$(x + 7 y) (7 x - y) = x (7 x - y) + 7 y (7 x - y)$

$= 7 x^{2} - x y + 49 x y - 7 y^{2}$

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

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