what is the expansion of (2x-3)^3
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using this identity ( a - b) 3 = a3 - b3 - 3ab ( a - b)
(2x - 3 )3 = 8x - 27 - 3* 2x * 3 ( 2x - 3)
= 8x - 27 - 18x ( 2x - 3)
= 8x - 27 - 36x2 + 54x
= -36x2 + 62x -27
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