Answer
The real solutions of a quadratic equation are equals to the points where its graph "touches" the x-axis, that is, the points where $ y = 0 $
Work Step by Step
For example, the equation $x^2+x-2=0\longrightarrow(x+2)(x-1)=0$
We can see that the solutions are $x=-2$ and $x=1$ and in the graph we can see the points $(-2,0)$ and $(1,0)$.