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(x + 5y)3

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Answer

(x + 5y)3

Using the formula,

(x + y)3 = x3 + y3 + 3x2y + 3xy2

= (x)3 + (5y)3 + 3 ×\times (x)2 ×\times (5y) + 3 ×\times (x) ×\times (5y)2

= x3 + 125y3 + 15x2y + 75xy2

Hence, (x + 5y)3 = x3 + 125y3 + 15x2y + 75xy2

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