Simplify: (5a-7)(5a-7)-(5a + 7)?
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Step-by-step explanation:
(5a-7)(5a-7)-(5a + 7)
=(5a-7)²-(5a+7)
={(5a)²+(7)²-2(5a)(7)}-(5a + 7)
={25a²+49-70a}-(5a+7)
=25a²+49-70a-5a-7
=25a²+42-75a
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