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Homework Help: Finding equation of a plane with 3 points

  1. Apr 19, 2014 #1
    1. The problem statement, all variables and given/known data
    attachment.php?attachmentid=68806&stc=1&d=1397897233.png


    2. Relevant equations
    N/A


    3. The attempt at a solution
    attachment.php?attachmentid=68807&stc=1&d=1397897233.jpg

    The problem is that I dont get the right answer which is:
    2x + y + 7z = -3.

    Can you please help me find where I went wrong?
     

    Attached Files:

  2. jcsd
  3. Apr 19, 2014 #2

    mfb

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    Staff: Mentor

    Can you explain what you calculated there?
     
  4. Apr 19, 2014 #3

    SammyS

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    You calculated the cross-product incorrectly.

    ##\left( -2 + 0 \right)\hat i \ne 0\hat i ##

    ##\hat k \left( \ (1) (-3) - (-2)(-2)\ \right)\ne \hat k \left(-3 + 4 \right)##
     
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