Solve ln ( ln ( ln ((e^x) +4)))=e

  • Thread starter frozen7
  • Start date
  • Tags
    Ln
In summary, the conversation discusses how to solve the equation ln(ln(ln((e^x)+4)))=e and suggests using the inverse relationship between the exponential function and natural logarithm. One method to solve the equation is to raise both sides to the power of e, which simplifies the equation to e^e^e^e = e^x +4, and then solve for x by subtracting 4 and taking the natural logarithm. The resulting value of x is approximately 20.
  • #1
frozen7
163
0
How to solve this?

ln ( ln ( ln ((e^x) +4)))=e
 
Physics news on Phys.org
  • #2
Hint: The exponential function is the inverse of the natural logarithm.
 
  • #3
I do it in this way:

e^e = ln ( ln ( e^x +4))
e^e^e = ln (e^x +4)
e^e^e^e = e^x +4
x = 20

Is it correct? Or is there any others more easier way?
 
  • #4
frozen7 said:
I do it in this way:

e^e = ln ( ln ( e^x +4))
e^e^e = ln (e^x +4)
e^e^e^e = e^x +4
x = 20

Is it correct? Or is there any others more easier way?

Correct. x = ln(e^e^e^e - 4) = 20.08553691561896
 

1. What is the purpose of this equation?

The purpose of this equation is to solve for the value of x that satisfies the given logarithmic expression.

2. How do you solve for x in this equation?

To solve for x, we must first simplify the equation by using the properties of logarithms. We can use the fact that ln(e^x) = x and ln(ln(x)) = ln(x) to simplify the equation to ln(x+4) = e. Then, we can use the inverse property of logarithms to rewrite the equation as e^e = x+4. Finally, we can solve for x by subtracting 4 from both sides, giving us x = e^e - 4.

3. Can this equation have multiple solutions?

Yes, this equation can have multiple solutions. Since the exponential function is one-to-one, it is possible for e^x to equal different values, resulting in different solutions for x.

4. Is there a specific domain for x in this equation?

Yes, in order for the equation to have a solution, the value of e^x must be greater than -4, as the natural logarithm is undefined for negative numbers. Therefore, the domain for x is x > ln(-4).

5. Can this equation be solved without using logarithms?

No, this equation cannot be solved without using logarithms. The equation is in the form of ln(ln(ln(e^x + 4))) = e, and the only way to isolate x is by using the properties of logarithms.

Similar threads

  • Introductory Physics Homework Help
Replies
12
Views
615
  • Introductory Physics Homework Help
Replies
2
Views
232
  • Introductory Physics Homework Help
4
Replies
116
Views
4K
  • Introductory Physics Homework Help
Replies
1
Views
950
  • Introductory Physics Homework Help
Replies
6
Views
1K
  • Introductory Physics Homework Help
Replies
4
Views
1K
  • Introductory Physics Homework Help
Replies
4
Views
1K
  • Introductory Physics Homework Help
Replies
4
Views
833
  • Introductory Physics Homework Help
Replies
1
Views
639
  • Introductory Physics Homework Help
Replies
4
Views
605
Back
Top