(a+b)²－9(ac+bc)+20c² (a²+5a)²+8(a²+5a)+16

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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