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(x + 3)³ = ?
by polynomial property (a+b)³ = a³ + b³ + 3ab(a+b)
(x+3)³ = x³ + 3³ + 3(x)(3){x+3}
(x+3)³ = x³ + 27 + 9x(x+3)
(x+3)³ = x³ + 27 + 9x² + 27x
so the cofficient of X =
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