(x \+ 5y) 3 Using the formula, (x \+ y) 3 = x 3 \+ y 3 \+ 3x 2 y \+ 3xy 2 = (x) 3 \+ (5y) 3 \+ 3 (x) 2 (5y) \+ 3 (x) (5y) 2 = x 3 \+ 125y 3 \+ 15x 2 y \+ 75xy 2 Hence, (x \+ 5y) 3 = x 3 \+ 125y 3 \+ 15x 2 y \+ 75xy 2

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(x + 5y)³

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