What is the expansion of (x+3y)^3
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Step-by-step explanation:
(a+b)^3 = a^3 + 3a^2b + 3ab^2 + b^3
(x + 3y) ^3 = x^3 + 3x^2*3y + 3 x *(3y) ^2 + (3y) ^3
= x^3 + 6x^2 y + 27x y^2 + 27 y^3
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