I know it's too late but still hope it helps others
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bcoz:
(a+b) ³=a³+b³+3a²b+3ab²
if we take:
(2a+b)³=(2a)³+b³+3.(2a)².b. +3.2a.b²
so, 8a³+b³+12a²b+6ab²
I know it's too late but still hope it helps others