The product of $(7 x - 4 y)$ and $(3 x - 7 y)$ is:

+ + 61xy

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- - 61xy

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+ - 61xy

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+ - 37xy

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Solution

The correct option is C
+ - 61xy

$(7 x - 4 y) (3 x - 7 y)$

$= 21 x^{2} - 12 x y - 49 x y + 28 y^{2}$

$= 21 x^{2} + 28 y^{2} - 61 x y$

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