Mark M. answered 02/26/21
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Since the exponent is 3, the relevant row of Pascal's Triangle is 1 3 3 1
(2x - 3)3 = (1)(2x)3(-3)0 + (3)(2x)2(-3)1 + (3)(2x)1(-3)2 + (1)(2x)0(-3)3
= 8x3 - 36x2 + 54x - 27