64 cube - 27 b cube minus 144 a square b + 108 a b square
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(64a)³ - (27b)³ - 144 a²b + 108 ab² =
(4a)³ - (3b)³ - 3 * (4a)² * 3b + 3 * 4a * (3b)²
(∵ a³ - b³ - 3a²b + 3ab²= (a - b)³)
∴(4a)³ - (3b)³ - 3 * (4a)² * 3b + 3 * 4a * (3b)² =
(4a - 3b)³ answer!
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