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Graphing equation

  1. Feb 1, 2016 #1
    1. The problem statement, all variables and given/known data
    So I have to do one simple task to identify graph to corresponding formula. I dont know if software is wrong or my approach.

    2. Relevant equations
    y =4√x-2 -6


    3. The attempt at a solution
    Found zero at x = 2 and when x=6 then y=2 and graph is not showing that. Something I missed? Look at picture. The correct answer is A.
    12.jpg
     
  2. jcsd
  3. Feb 1, 2016 #2

    RUber

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    Just to be sure, you are looking at ##4\sqrt{x-2}-6##?
    That does not have a zero at x=2.
     
  4. Feb 1, 2016 #3
    -6 is not in the sqrt
     
  5. Feb 1, 2016 #4

    ehild

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    No, that is wrong. Solve the equation ##0=4\sqrt{x-2}-6##
    On the y axis, the numbers are above the scales. So the first scale is 2. y=2 at x=6 in figure A.
     
  6. Feb 1, 2016 #5

    RUber

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    So the zero should be around 4.25, right?
     
  7. Feb 1, 2016 #6
    Ok I got it. It was mine and graphs fault.
     
  8. Feb 2, 2016 #7

    HallsofIvy

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    Rather than solve an equation I would just notice that f(0) is not a real number and f(2)= -6, not -8. None of the given graphs is correct.
     
  9. May 22, 2016 #8
    I think graph A is correct, the numbers are just placed in a strange way on the y axis.
     
  10. May 22, 2016 #9

    ehild

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    Yes, the numbers are shifted one scale. It should look as in the figure.
    upload_2016-5-23_6-45-16.png
     
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