factorise each of the following 8a³-b³-12a²b+6ab²
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=(2a)^3 - (b)^3 - 3×(2a)^2×b+ 3×2a×(b)^2
we know that (a-b)^3= a^3 - b^3 -3a^2b + 3 ab^2
therefore, (2a- b) ^3 is the answer
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