college algebra
posted by ladybug on .
determine the quadratic function of f whose graph is the vertex of (1,4) and the yintercept is 3.

since we know the vertex,start with
y = a(x1)^2  4
but (0,3) lies on it , so ...
3 = a(01)^2  4
3+4 = a
a = 1
y = (x1)^2  4