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Algebraic Identities

Expand : 4x-...

Question

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$(4 x - 5 y)^{3}$

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Solution

$(4 x - 5 y)^{3}$
$= 64 x^{3} - 125 y^{3} - 60 x y (4 x - 5 y)$
$= 64 x^{3} - 125 y^{3} - 240 x^{2} y + 300 x y^{2}$

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