We know that f of two, f of two is going to be equal to negative two, we see it in that table. And what's f of four? F of four is equal to three. F of four is equal to three. So zero is between f of two and f of four. And you can see it visually here. There's no way to draw between this point and that point without picking up your pen, without crossing the x-axis, without having a point where your function is equal to zero.