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.