I'm just applying the chain rule here, and that's just going to be one. And when we take the derivative now with respect to X, F prime of X, well this is going to be the derivative of the natural log of X plus five with respect to X plus five, so that's going to be one over X plus five times the derivative of X plus five with respect to X. We can write F of X as being equal to the natural log of X plus five minus the natural log of X minus one. It from a point of view in terms of having to So if we just apply this property right over here, and just simplify this expression, or at least simplify So this is just going to be equal to the natural log of A minus the natural log of B. The easy way is to recognize your logarithm properties, to remember that the natural log of A over B. And I encourage you to pause this video and try to figure it out on your own. And what we want to figure out is what is F prime of X. Voiceover:Let's say that we've got the function F of X and it is equal to the natural log of X plus five over X minus one.
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