## College Algebra (6th Edition)

The real solutions of a quadratic equation are equals to the points where its graph "touches" the x-axis, that is, the points where $y = 0$
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 $(1,0)$.