Expand the following using identities
$(3 x - 4 y)^{2}$

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Solution

$(3 x - 4 y)^{2} = (3 x)^{2} - 2 (3 x) (4 y) + (4 y)^{2}$

$= 9 x^{2} - 24 x y + 16 y^{2}$

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