Find the product of $(7 x - 4 y)$ and $(3 x - 7 y)$ .
$[2 M a r k s]$

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Solution

To find: The product of $(7 x - 4 y) (3 x - 7 y)$ .

$(7 x - 4 y) (3 x - 7 y)$
$= [7 x \times (3 x - 7 y)] - [4 y \times (3 x - 7 y)]$
$[1 M a r k]$
$= 21 x^{2} - 49 x y - 12 x y + 28 y^{2}$
$= 21 x^{2} + 28 y^{2} - 61 x y$
$[1 M a r k]$

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$Find the product of (7 x - 4 y) and (3 x - 7 y) .$

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