I don't get the answer to the solution of the problem. I understand that k=c+8, but I don't understand why the upper bound of k is when x=0, as x has to be a positive real number. Thanks in advance.
2026-04-12 03:32:17.1775964737
Don't understand solution to this mock AMC 12?
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If $x<0$ then $x-2<-2,$ so $(x-2)^2>4.$