Question

Simplify (6x+5y)cube
Pls answer according to class 9

Answer 1

Using the formula,

$(x+y)^3 = x^3+y^3+3x^2y+3xy^2$

So,

$(6x+5y)^3 \\\\= (6x)^3+(5y)^3+3(6x)^2(5y)+3(6x)(5y)^2\\\\= 216x^3 + 125y^3 + 540x^2y+450xy^2$

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