(2a+3b)^3 - (2a-3b) ^3. factorise
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(2a+3b)3 = 8a³+36a²b+54ab²+27b³
(2a-3b)3 = 8a³-6a²b+54ab²-27b³
72a2b + 54b3 = 18b(4a2 + 3b2)
18b(4a2 + 3b2)
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