# Thread: Finding x-intercept for x-ln(x)

1. ## Finding x-intercept for x-ln(x)

Just like the subject

Finding x intercept for the function $x-ln(x)$

I know the answer but I couldn't figure it out how to get it.

I have something like this, but got stuck : $e^x = x$?

Thanks

2. Originally Posted by billyso23
Just like the subject

Finding x intercept for the function $x-ln(x)$

I know the answer but I couldn't figure it out how to get it.

I have something like this, but got stuck : $e^x = x$?

Thanks
There isn't an exact answer, so you'll have to use a numerical method like the bisection method or Newton's method.

3. Originally Posted by Prove It
There isn't an exact answer, so you'll have to use a numerical method like the bisection method or Newton's method.
To be pedantic, there is an "exact" answer- you just can't find it it!

4. Prove It

No wonder. The original question is finding the 1st and 2nd derivative of the mentioned function, and graph the function.

Our class has not covered the Newton method yet. So, with what I have learn thus far, I won't be able to solve that. Is that correct?