So, Y=-X^2 would look like this:

Answer by ashipm01(26)   (Show Source): You can put this solution on YOUR website!
To graph the function , you can start by evaluating various points on the graph and plotting those points. For example, if you construct a table similar to:
x | -x^2
--------------
-2 | -4
-1 | -1
0 | 0
1 | -1
2 | -4
That should be good enough for this graph since there is one critical point on this function, namely f(0) = 0. As x approaches either positive infinity or negative infinity, the function value, f(x), approaches negative infinity.