Question 1041715
<pre>
The vertex form equation of the parabola with vertex (h,k), 
axis of symmetry: y = k, length of latus rectum = |4a|
is:

(y-k)² = 4a(x-h)

Substitute h=10, k=0, a=-1/4 since |4a|=1 and a < 0.

Edwin</pre>