So for example, in this situation right here, if you just tried to evaluate it at x equals four, you get the square root of four minus two over four minus four, which is zero over zero. So it's that indeterminate form and the technique here, because we're seeing this radical and irrational expression, is hey, let's maybe, maybe we can somehow get rid of that radical or simplify it somehow. So let me rewrite it. Square root of x minus two over x minus four. When we say conjugate, let's multiply it by the square root of x plus two over the square root of x plus two. Once again, it's the same expression over the same expression, so I'm not fundamentally changing its value. And so this is going to be equal to, well if I have a plus b times a minus b, I'm gonna get a difference of squares.