factorise 8a^3-72^2+216a-216 ???????????????????
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8a³-72a²+216a-216
(2a)³-3(2a)²(6)+3(2a)(6²)-(6)³
a³-3a²b+3ab²-b³ = (a-b)³
= (2a-6)³
(2a)³-3(2a)²(6)+3(2a)(6²)-(6)³
a³-3a²b+3ab²-b³ = (a-b)³
= (2a-6)³
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