factorise (2a- 1/b6)³
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Step-by-step explanation:
factorise by the formula (a+b)³,
(a-b)³=a³-3a²b+3ab²-b³
(2a-1/6b)³
=(2a)³-3(2a)²(1/6b)+3(2a)(1/6b)²-(1/6b) ³
=8a³-3(4a²)(1/6b)+3(2a)(1/36b²) -1/216b³
=8a³-(2a²/b)+(a/6b²)-1/216b³
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