Question 419098
(x-2)^2
=x^2-4x+4
-b/2a=4/2=2 (x at the vertex)
4-8+4=0 (y at the vertex when x=2)
(2, 0) the vertex point on a graph.
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Ed
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{{{graph(500,500,-10,10,-10,10,x^2-4x+4)}}}