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Multiplication of Any Polynomial

Find the prod...

Question

Find the product of $(7 x + 3 y) (7 x - y)$

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Solution

given, $(7 x + 3 y) (7 x - y)$

$= 7 x (7 x - y) + 3 y (7 x - y)$

$= 49 x^{2} - 7 x y + 21 x y - 3 y^{2}$

$= 49 x^{2} + 14 x y - 3 y^{2}$

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