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Verified answer
(2a - 3b)⁵= (2a)⁵ - 5(2a)⁴(3b) + 10(2a)³(3b)² - 10(2a)²(3b)³ + 5(2a)(3b)⁴ - (3b)⁵
= 32 a⁵ - 240 a⁴b + 720 a³b² - 1080 a²b³ + 810 ab⁴ - 243 b⁵