The coefficient of x in the expainsion (3x + 2)³ is?
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given; (3x + 2)³
to find coefficient of x³
[( a + b )³ = a³ + b³ + 3ab ( a + b )]
(3x + 2)³ = (3x)³ + 2³ + 3*3x*2* (3x + 2)
=> 27x³ + 8 + 18 x ( 3x + 2)
=> 27x³ + 8 + 54 x² + 36 x
therefore coefficient of x³ = 27
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