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= (a - 2b)² (a - 2b) - (a + 2b)² (a + 2b)
= (a² - 4ab + 4b²)(a - 2b) - (a² + 4ab + 4b²)(a + 2b)
= (a³ - 2a²b - 4a²b + 8ab² + 4ab² - 8b³) - (a³ + 2a²b + 4a²b + 8ab² + 4ab² + 8b³)
= (a³ - 6a²b + 12ab² - 8b³) - (a³ + 6a²b + 12ab² + 8b³)
= a³ - 6a²b + 12ab² - 8b³ - a³ - 6a²b - 12ab² - 8b³
= -12a²b - 16b³