Finding the Derivative of e

Question

The question asks:

Let f(x)=(ln x)^7

a. f'(x)=

b. f'(e^3)=

I got part a. already. 7(ln x)^6*(1/x)

I can't figure out part b.

I thought it would be you just plug in e^3 for x and that was it, but obviously not.

Any help is appreciated, many thanks!

Answer 1

e is just a number. It's close to the number 3. So, if they asked you what the derivative of 3³ (in other words, the derivative of 27), what would you say?