a² - 2a - 2b - b² = (a² - b²) - (2a + 2b) = (a - b)(a + b) - 2(a + b) =
= (a + b)(a - b - 2)
(a²-b²)-2(a+b)=(a-b)(a+b)-2(a+b)=(a+b)((a-b)-2)
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a² - 2a - 2b - b² = (a² - b²) - (2a + 2b) = (a - b)(a + b) - 2(a + b) =
= (a + b)(a - b - 2)
(a²-b²)-2(a+b)=(a-b)(a+b)-2(a+b)=(a+b)((a-b)-2)