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anonymous

  • one year ago

Help! How to make an extraneous equation? I need to make an equation that when substituted into it's original equation, doesn't equal the original answer (I hope that makes sense) and the equation I made is non extraneous. My equation was the square root of (x+9) plus 2 = 20. But, it was non extraneous.

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  1. anonymous
    • one year ago
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    try \[\sqrt{x+9}+2=1\]

  2. anonymous
    • one year ago
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    That worked, thanks! to be sure, is the solution x=-7?

  3. anonymous
    • one year ago
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    and when I tried to see if it was extraneous, I got 4=-1

  4. anonymous
    • one year ago
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    there is no solution, but i guess the "extraneous" one would be \(-8\)

  5. anonymous
    • one year ago
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    Sorry, I'm confused. I solved the equation and got -7 haha

  6. anonymous
    • one year ago
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    \[\sqrt{x+9}+2=1\\ \sqrt{x+9}=-1\\ x+9=1\\ x=-8\]

  7. anonymous
    • one year ago
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    oh ok! I put -7 instead of 8 for some reason. Thanks!

  8. anonymous
    • one year ago
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    yw

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