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The graph for *a = -1*

f(x) = (x-2)^2 + a

a. What are the coordinates of the top of the graph?

b. How many points of intersection does the graph have when it's *a = -1* and *y = 5 ?*

c. For which values of *a* does the accompanying graph not share a point with the x-axis?

~~English isn't my mother tongue so I apologize for my poor english.~~

Guest Jul 3, 2018