And so he can't make this statement without seeing where our second derivative could be undefined. So for example, he could say that g prime prime is undefined, undefined when what? Well, this is going to be undefined when x is equal to zero. X zero to the fifth, cube root of that, that's gonna be zero but then you're dividing by zero. So g prime prime undefined when x is equal to zero. So therefore, x equals, so we could say, candidate, candidate, candidate inflection point when x equals zero. And so then we would want to test it.