4a² - 12ab + 9b² - 4(a² + 2ab + b²) =
4a² - 12ab + 9b² - 4a² - 8ab - 4b² =
= - 20ab + 5b² = 5b(- 4a + b)
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4a² - 12ab + 9b² - 4(a² + 2ab + b²) =
4a² - 12ab + 9b² - 4a² - 8ab - 4b² =
= - 20ab + 5b² = 5b(- 4a + b)