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Beautiful_Lier96

can someone check my work? solve √(2x-1)=x-8 i came up with x=13 x=5. may i ask which one it is ?

  • one year ago
  • one year ago

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  1. hartnn
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    if you put back x=5 you'll get \(\sqrt{9} =-3 \) which isn't true...its just +3 and not -3

    • one year ago
  2. hartnn
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    x=13 is correct.

    • one year ago
  3. hartnn
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    the reason you got 2 values instead of one is that you might have squared both sides of that equation. this adds/attaches one more root to the equation which may not satisfy the original equation.

    • one year ago
  4. Beautiful_Lier96
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    oooh. thanks :) i understand now. i did square both sides because i did not understand which property to do..

    • one year ago
  5. hartnn
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    ok, welcome ^_^ glad i could help :)

    • one year ago
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