How Do You Solve the Absolute Value Equation -3|x+5| + 1 = 7|x+5| + 8?

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Discussion Overview

The discussion revolves around solving the absolute value equation -3|x+5| + 1 = 7|x+5| + 8. Participants explore the steps involved in manipulating the equation and identify issues related to the nature of absolute values.

Discussion Character

  • Mathematical reasoning

Main Points Raised

  • One participant presents a solution process leading to |x+5| = -7/10, suggesting the steps taken to isolate the absolute value.
  • Another participant points out that reaching |x+5| = -7/10 indicates a problem, emphasizing the impossibility of an absolute value being negative.
  • A subsequent reply reiterates the issue with the negative result, clarifying that the problem lies in the negative value of -7/10.
  • One participant concludes that there is no solution to the equation based on the identified problem.

Areas of Agreement / Disagreement

Participants generally agree that the equation leads to an impossible situation due to the negative absolute value, but there is no consensus on the implications of this outcome beyond stating that there is no solution.

Contextual Notes

The discussion does not delve into the implications of absolute values in broader contexts or explore alternative methods for approaching the problem.

mathdad
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-3|x+5| + 1 = 7|x+5| + 8 Solution:

-3|x+5| – 7|x+5| = 7
-10 |x+5| = 7
|x+5| = -7/10
x+5 = ±(-7/10)
x = ±(-7/10) – 5

x₁ = -7/10 – 5
x₁ = -57/10

x₂ = 7/10 – 5
x₂ = 2/10
x₂ = 1/5

Correct?
 
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RTCNTC said:
-3|x+5| + 1 = 7|x+5| + 8 Solution:

-3|x+5| – 7|x+5| = 7
-10 |x+5| = 7
|x+5| = -7/10

When you reach this point, then you should observe that you have a problem...can you identify the problem?
 
MarkFL said:
When you reach this point, then you should observe that you have a problem...can you identify the problem?

The problem is |x+5| = -7/10. More clearly, the problem is the negative -7/10.
 
No solution is the answer.
 

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