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-4a(4a + 2b) + b(4a + 2b) =
-16a² - 8ab + 4ab + 2b² =
-16a² - 4ab + 2b²
-4a(4a + 2b) + b(4a + 2b) =
-16a² - 8ab + 4ab + 2b² =
-16a² - 4ab + 2b²