# How do you find out the equation of a parabola given the vertex (1 1/2, 3), and it cuts the y axis at 7 1/2?

##### 1 Answer

Apr 30, 2015

In this way:

The equation of the parabolae (

So:

If *our* parabola cuts the y-axis at

Let's use this condition to find

So:

And now, if you need, you can do the counts.