Shouldn't these 2 equations be equal?

  • Thread starter tamtam402
  • Start date
In summary, when trying to simplify e3ln2, it is important to remember that e^{x+y} does not equal e^xe^y, and therefore e3ln2 does not equal e3*eln2. The correct simplification is e3ln2 = eln(2^3) = eln(8) = 8. Remembering this rule will prevent any errors when solving similar problems.
  • #1
tamtam402
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0

Homework Statement


I was doing a math problem, where I forgot to simplify e3ln2.


Homework Equations





The Attempt at a Solution



Instead of doing e3ln2 = eln(2^3) = eln(8) = 8, I did the following:


e3ln2 = e3*eln2 = 2e3

However, 2e3 ≠ 8.

What happened?
Mod edit: The OP figured it out.
 
Last edited by a moderator:
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  • #2
Just in case someone stumbles here with the same problem, my mistake was to assume e3ln2 = e3*eln2.

That statement is false since e3*eln2 = e3+ln2 ≠ e3ln2.
 
  • #3
Well, let's hope that people who are attempting to solve problems like this will know that [itex]e^{x+ y}= e^xe^y\ne e^{xy}[/itex].
 

1. Why is it important for these two equations to be equal?

It is important for these two equations to be equal because it signifies that both sides of the equation represent the same quantity or relationship. If the equations are not equal, it means that there is an error or inconsistency in the calculations, which can affect the accuracy and validity of the results.

2. What could be the possible reasons for these equations not being equal?

There could be several reasons for equations not being equal, including errors in the calculations, incorrect assumptions, or missing variables. It is also possible that the equations are not meant to be equal and represent different aspects of the problem.

3. How can we determine which equation is correct if they are not equal?

To determine which equation is correct, we can compare the equations to known mathematical principles and laws, and check for consistency with other known information about the problem. We can also perform further experiments or calculations to validate the equations and determine their accuracy.

4. Can we still use the equations if they are not equal?

It depends on the purpose of the equations. If they are being used as a model or approximation, small differences may be acceptable. However, if the equations are meant to represent an exact relationship, it is important to identify and correct any discrepancies to ensure the accuracy of the results.

5. Are there any techniques for making sure that equations are equal?

Yes, there are various techniques for ensuring that equations are equal, such as using algebraic manipulation, substitution, or graphing. Additionally, it is important to double-check the calculations and assumptions made in deriving the equations to identify any potential errors.

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