Standard form is f(x)=ax^2+bx+c
order of power
f(x)=2x^2-11x+2
<h2>SOLVING</h2>

Find the gradient of the line segment between the points 

The formula used, here is


Now let's put in the co-ordinates from these two points.
| subtract on top & bottom
| divide





0,-5,-10,-15. It is that simple. All you had to do is keep counting down.
Hope this helps :)