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(2x-1)³ = (4x²-2x-2x+1) x (2x-1)
(2x-1)³ = (4x²-4x+1) x (2x-1)
(2x-1)³ = 8x³-4x²-8x²+4x+2x-1
(2x-1)³ = 8x³-12x²+6x-1
= (2x)^3 + 3(2x)^2(-1) + 3(2x)(-1)^2 + (-1)^3
= 8x^3 - 12x^2 + 6x - 1