Logarithmic Equation with x on both sides

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SUMMARY

The discussion centers on solving the exponential equation 18x² = 6e^(2x). Participants clarify that the equation can be transformed into 3x² = e^(2x) and subsequently into log(3) + 2*log(x) = 2*x. It is established that the equation cannot be solved using elementary functions, but solutions can be approximated numerically using methods such as the Intermediate Value Theorem. The importance of proper notation and parentheses in mathematical expressions is also emphasized.

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Exponential Equation with x on both sides

Homework Statement



18x^2=6e^(2x)

Homework Equations


I don't know any for the step I got stuck on.


The Attempt at a Solution


3x^2=e^2x
ln3x^2=lne^2x
2ln3x=2x
ln3x=x
 
Last edited:
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Please start using more parentheses, ok? If you mean 3*x^2=e^(2x), then taking logs gives you log(3)+2*log(x)=2*x. The left side is not 2ln3x, whatever that means. You can't solve that using elementary functions. You can prove a solution exists, and you can solve it numerically, but that's about it.
 
Thank you for your reply! And sorry about the lack of parenthesis.

By solving it numerically, do you mean guess and checking values for x? Or actually solving for x?
 
Negima said:
Thank you for your reply! And sorry about the lack of parenthesis.

By solving it numerically, do you mean guess and checking values for x? Or actually solving for x?

Well yes you can guess values using the intermediate value theorem and show that a solution exists.
 

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