Solve 2^3x=7^(x+1): Logarithms Solution

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Homework Help Overview

The problem involves solving the equation 2^{3x} = 7^{x+1}, which falls under the topic of logarithms and exponential equations.

Discussion Character

  • Exploratory, Mathematical reasoning, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the initial steps of applying logarithms to both sides of the equation. There is uncertainty about the correctness of the steps taken, particularly in the manipulation of logarithmic expressions.

Discussion Status

Some participants have made attempts to rearrange the equation and express it in terms of logarithms, while others provide feedback on these attempts. There is a recognition of the need to isolate x, but no consensus on the next steps has been reached.

Contextual Notes

Participants are navigating through the algebraic manipulation of logarithmic forms and expressing concerns about the direction of their approaches. There is an acknowledgment of the numerical nature of logarithmic values involved.

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Homework Statement



2^{3x} = 7^{x+1}

Homework Equations



N/A

The Attempt at a Solution



2^{3x} = 7^{x+1}

I'm not entirely sure how to proceed from here. I'm assuming that the following is the right step towards the solution...

(log2)(3x) = log(7)(x+1)

...but I'm not entirely sure.

Any suggestions?

Thanks,
 
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AbsoluteZer0 said:

Homework Statement



2^{3x} = 7^{x+1}

Homework Equations



N/A

The Attempt at a Solution



2^{3x} = 7^{x+1}

I'm not entirely sure how to proceed from here. I'm assuming that the following is the right step towards the solution...

(log2)(3x) = log(7)(x+1)

...but I'm not entirely sure.

Any suggestions?

Thanks,

You are doing just fine. Now solve for x.
 
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I've arrived at

\frac{3x}{x+1} = \frac{log7}{log2}

I'm not sure how to progress.
What should I do next?

Thanks,
 
AbsoluteZer0 said:
I've arrived at

\frac{3x}{x+1} = \frac{log7}{log2}

I'm not sure how to progress.
What should I do next?

Thanks,

You are kind of going the wrong way. You've got log(2)*3x=log(7)(x+1)=log(7)x+log(7). Move all the terms involving x to one side and solve for x. log(2) and log(7) are just numbers.
 
Last edited:

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