Let's say you have a function, call it \(\displaystyle y=f(x)\). This is any ol' function, not necessarily a parabola. Could be a straight line, could be a parabola, could be a sine wave, etc. Let's say it has a "root" at \(\displaystyle x=3.\) Graphically, what is happening to \(\displaystyle f(x)\) at \(\displaystyle x=3\)?