find the product (9x+3y)^3
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Answer:
we know,
(a+b)³ = a³+b³+3ab(a+b)
(9x+3y)³ = (9x)³+(3y)³+3×9x×3y(9x+3y)
= 729x³+27y³+81xy(9x+3y)
= 729x³+27y³+729x²y+243xy²
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