a³ + 8b - 8a - a²b = a³ - a²b + 8b - 8a = a²(a - b) - 8(a - b) = (a² - 8)(a - b)
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a³ + 8b - 8a - a²b = a³ - a²b + 8b - 8a = a²(a - b) - 8(a - b) = (a² - 8)(a - b)