Answer:
(a + c)(a + 2b - c)
Explanation:
(a² + 2ab) - (c² - 2bc) =
= a² + 2ab - c² + 2bc
= a² - c² + 2ab + 2bc
= (a + c)(a - c) + 2b(a + c)
= (a + c)(a + 2b - c)
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