Answer
See the graph
Work Step by Step
Factoring gives $y=-4 c x+x^2+4 c^2=x^2-4 c k+4 c^2=(x-2 c)^2$. Since $c>0$, this is the graph of $y=x^2$ shifted to the right $2 c$ units. For $c= 1$, the following graph can be obtained.
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