Expand (2a - 3b)3.

(2a – 3b)3
Using the formula (x – y)3 = x3 – y3 – 3xy(x – y),
(2a – 3b)3 = (2a)3 – (3b)3 – 3(2a)(3b)(2a – 3b)
= 8a3 – 27b3 – 18ab(2a – 3b)
Or
= 8a3 – 27b3 – 36a2b + 54ab2

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