# Math Help - Graph of Function F/F'

1. ## Graph of Function F/F'

So my question is how do I sketch a graph for the F' with the equation f(x) = lnx ? I graphed f(x) but I don't know where to go from there.

2. Originally Posted by FalconPUNCH!
So my question is how do I sketch a graph for the F' with the equation f(x) = lnx ? I graphed f(x) but I don't know where to go from there.
Are you going to $F(x) = \frac{f(x)}{f'(x)}$ then $F(x) = \frac{\ln x}{\frac{1}{x}} = x\ln x$.

3. Originally Posted by ThePerfectHacker
Are you going to $F(x) = \frac{f(x)}{f'(x)}$ then $F(x) = \frac{\ln x}{\frac{1}{x}} = x\ln x$.
My professor wants us to graph F' without an equation. He wants us to use the graph of f(x) to graph F'. I'm confused and don't really know what to do for f(x) = lnx