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[Formula for finding the "x" value of the vertex]
.
a = 1
b = 0
c = -2
.

(-0)/(2)(1)[Plug-in the values]
0 [The x valued of the vertex = 0]
.

[Plug (x=0) back into the function and solve for "y"]
y = -2
.
(0, -2) [Values of the vertex]