How do you find the quadratic function with vertex (-2,5) and point (0,9)?
Vertex form of a quadratic equation is
In this case, h is -2 and k is 5.
Thus the equation becomes
In order to find out a, we must plug in the x- and y-values of the point we want the equation to pass through.
The equation becomes:
Finally the equation is
Another way to put it is: