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Anonymous
The expression is faulty because we don't have + or - before 10a. Also have to assume a2 is a2 . Use the standard formula for solving a quadratic = 0, to get two answers p and q. Then the factorization is (a-p)(a-q).
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a2-b2 = (a-b)(a+b)
(a2+2b2-2ab)(a2+2b2+2ab)
16 - a2
5(a2-3)
ANS:(a-3)(a+1)