factorise - 8acube - b cube - 12asquare b +6absquare
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8a^3 - b^3 - 12a^2 b + 6ab^2
=> (2a)^3 - (b)^3 - 6ab ( 2a - b)
=> (2a)^3 - (b)^2 - 3(2a)(b)(2a-b)
=> (2a - b)^3
=> (2a - b) (2a - b) (2a - b)
=> (2a)^3 - (b)^3 - 6ab ( 2a - b)
=> (2a)^3 - (b)^2 - 3(2a)(b)(2a-b)
=> (2a - b)^3
=> (2a - b) (2a - b) (2a - b)
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