First, you should type in the numbers that change the equation. The equation looks like aX^2+bX+c=d Whrite first in "a" then "b"... Then you see how the graph and the answer coming up.
This is a program that solves simple square equations. I´ve always liked math and therefore I thought it was a fun easy thing to test. But it went very fast so I added a graph system. It´s based on 20 pixels so it does not reach that far.