Solving a Limit: Finding the Right Approach

In summary, the conversation is about finding a way to solve the limit \lim_{x \rightarrow \infty} \left( 1 + 10^{-x}\right)^\left(10^x\right), which involves common adjustments for logarithms and no other ideas. However, upon further examination, it is pointed out that it is similar to the limit \lim_{x \rightarrow \infty} \left( 1 + \frac{1}{x} \right) ^ x, which equals e. This leads to a solution for the original limit.
  • #1
twoflower
368
0
Hi all,

could you help me how to solve this limit?

[tex]
\lim_{x \rightarrow \infty} \left( 1 + 10^{-x}\right)^\left(10^x\right)
[/tex]

Common adjustments for log involving the limit log (1)/0 don't work and no other idea comes to my mind...

Thank you for any help.
 
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  • #2
Hmm,...
Look at the problem again, it looks incredibly like:
[tex]\lim_{x \rightarrow \infty} \left( 1 + \frac{1}{x} \right) ^ x = e[/tex]
Can you go from here?
Viet Dao,
 
  • #3
VietDao29 said:
Hmm,...
Look at the problem again, it looks incredibly like:
[tex]\lim_{x \rightarrow \infty} \left( 1 + \frac{1}{x} \right) ^ x = e[/tex]
Can you go from here?
Viet Dao,

Yep, you're right, can't believe I didn't see it :) Thanks.
 

FAQ: Solving a Limit: Finding the Right Approach

What is a limit in mathematics?

A limit in mathematics is a fundamental concept that describes the behavior of a function as the input variable approaches a certain value. It is used to determine the value that a function approaches as the input variable gets closer and closer to a specific value.

Why is it important to find the right approach when solving a limit?

Finding the right approach when solving a limit is important because it can help you accurately determine the value of the limit. Different approaches may lead to different results, so it is crucial to choose the most appropriate method to ensure the accuracy of the answer.

What are some common approaches for solving limits?

Some common approaches for solving limits include direct substitution, factoring and simplifying, using the limit laws, and using L'Hôpital's rule. These methods can be used depending on the type of limit and the given function.

Can a limit not exist?

Yes, a limit can fail to exist if the function has a discontinuity at the point where the limit is being evaluated. This can happen if the left and right-hand limits are not equal, or if the function has a vertical asymptote at that point.

How can I check if my answer is correct when solving a limit?

You can check if your answer is correct by using a graphing calculator or graphing software to graph the function and visually compare the behavior of the function near the limit point to the value you obtained. You can also use online limit calculators to verify your answer.

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