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(5x + 3y)3

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Answer

Using the formula,

[∵ (x + y)3 = x3 + y3 + 3x2y + 3xy2]

So,

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

= 125x3 + 27y3 + 225x2y + 135xy2

Hence, (5x + 3y)3 = 125x3 + 27y3 + 225x2y + 135xy2.

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