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Help me figure out why I'm getting this extraneous solution

Posted 10 years ago
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Here is the link for the problem I did on wolfram, it tells me that x equals 3 and -5, but -5 is selected as the actual answer, but I dont understand why?
POSTED BY: claribel sanchez
Hi. Can you clarify what you mean?

Wolfram|Alpha provides both answers (3 and -5) to the equation. Both numbers solve the equation. 
POSTED BY: Sean Clarke
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