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Factorization (a+b)²-9(ac+bc)+20c² =(a+b)²-9(a+b)c+20c² =(a+v-4c)(a+b-5c) (a²+5a)²+8(a²+5a)+16 =(a²+5a+4)² =(a+4)²(a+1)²
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