Solving for x with natural logs

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In summary, The conversation is about solving for x in an equation and the speaker is asking for help. They are given a tip to simplify the equation and work from the outside in. Then, they are told to raise e to the power of 3 in order to solve for x.
  • #1
Ry122
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Hi
Im having difficulty solving for x in this equation.
5=9ln(x+4)
I have no idea where to start so i can't show u any working.
 
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  • #2
can you show at least one step? there is at least one very easy step that you could do.

question: if i ask u to find ln(x+2) = 3, how can you get rid of ln?
 
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  • #3
Take another look and don't get bogged down in details until youve done some basic simplification. Work from the outside in and you should be able to rearrange this into something you're much more happy to deal with.

Roco covered it pretty well when he told you there was one easy step you could do =-)
 
  • #4
raise e to the power of 3?
 
  • #5
Ry122 said:
raise e to the power of 3?
yep

[tex]\exp^{\frac{5}{9}}=(x+4)[/tex]

now just solve for x
 

FAQ: Solving for x with natural logs

What is the purpose of solving for x with natural logs?

The purpose of solving for x with natural logs is to find the unknown variable, x, in an equation that involves the natural logarithm function. This method is commonly used in scientific and mathematical calculations, as well as in finance and economics.

What are natural logarithms?

Natural logarithms, denoted as ln(x), are logarithmic functions with a base of e (Euler's number, approximately equal to 2.71828). They are the inverse of the exponential function, e^x, and are commonly used in calculus and other mathematical applications.

What are the steps for solving an equation with natural logs?

The steps for solving an equation with natural logs are as follows:
1. Isolate the natural log term on one side of the equation.
2. Take the antilog of both sides to remove the natural log.
3. Simplify the resulting equation.
4. Solve for the unknown variable, x.
5. Check your solution by substituting it back into the original equation.

What are some common mistakes when solving for x with natural logs?

Some common mistakes when solving for x with natural logs include:
- Forgetting to isolate the natural log term before taking the antilog.
- Taking the antilog of only one side of the equation.
- Incorrectly simplifying the antilog expression.
- Forgetting to check the solution by substituting it back into the original equation.
It is important to carefully follow the steps and double check your work to avoid these mistakes.

Are there any alternative methods for solving equations with natural logs?

Yes, there are alternative methods for solving equations with natural logs such as using logarithmic properties or converting the equation to exponential form. However, solving for x with natural logs is often the most efficient and straightforward method when dealing with equations involving natural logarithms.

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