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Expansion of (x^2 - y^2)

Multiply 7x-...

Question

Multiply
$(7 x - 3 y) b y (4 x - 5 y)$

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Solution

$(7 x - 3 y) (4 x - 5 y)$

$= 7 x (4 x - 5 y) - 3 y (4 x - 5 y)$

$= 28 x^{2} - 35 x y - 12 x y + 15 y^{2}$

$= 28 x^{2} - 47 x y + 15 y^{2}$

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