We have the following function that is a quadratic function:
[tex]y=-x+x^2[/tex]
So the graph of this function is shown in the figure below. This is a parabola as you can see. The roots of this functions, that is, the x-intercepts are:
[tex]y=-x+x^2 \\ y=x(x-1) \\ \\ x_{1}=0 \ and \ x_{2}=1[/tex]
As you can see in the figure. This function decreases from [tex](-\infty,0.5)[/tex] and increases from [tex](0.5, \infty)[/tex]
Finally, another thing we can see from the graph is that the vertex is the point:
[tex]V(0.5,-0.25)[/tex]