Question

expand using identities (3x+2y)^3​

Answer 1

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Answer 2

FORMULA=(a+b)^3

=a^3+b^3+3ab(a+b)

Now substitute,

a=3x

b=2y

=(3x)^3+(2y)^3+3(6xy)(3x+2y)

=27x^3+8y^3+18xy(3x+2y)

=27x^3+8y^3+18xy(3x)+18xy(2y)

=27x^3+8y^3+54x^2y+36xy^2

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