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