Posted by ladybug on Wednesday, November 14, 2012 at 1:44pm.
since we know the vertex,start with
y = a(x-1)^2 - 4
but (0,-3) lies on it , so ...
-3 = a(0-1)^2 - 4
-3+4 = a
a = 1
y = (x-1)^2 - 4
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