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Math Help - Finding x-intercept for x-ln(x)

  1. #1
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    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
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  2. #2
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    Quote Originally Posted by billyso23 View Post
    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.
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  3. #3
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    Quote Originally Posted by Prove It View Post
    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!
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  4. #4
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    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?
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