e. 25a + 20ac - 4b2+ 8bc
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25a2-4b2+28bc-49c2
= (5a)2-(4b2-28bc +49
=(5a)²- {(2b)² - 2(2b)(7c)
= (5a)2-(2b-7c)2
= (5a-2b +7c)(5a + 2b-7
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