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Letters for Digits

Expand : 5x+...

Question

Expand :
$(5 x + 3 y)^{3}$

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Solution

given, $(5 x + 3 y)^{3}$

$= 125 x^{3} + 27 y^{3} + 45 x y (5 x + 3 y)$

$= 125 x^{3} + 27 y^{3} + 225 x^{2} y + 135 x y^{2}$

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