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Homework Help: Writing an equation in general form (circles)

  1. Jan 6, 2010 #1
    (keep in mind, its circle math.. :/)
    Write the equation (x+9)2+(y-5)2=12 in general form.
  2. jcsd
  3. Jan 6, 2010 #2


    Staff: Mentor

    If my memory is correct, general form is just Ax2 + By2 + Cx + Dy + E = 0. In this case, A and B are 1. Just expand what you have to write your equation in general form.
  4. Jan 6, 2010 #3
    okay, but
    Ax2 + By2 + Cx + Dy + E = 0
    where do i get E...
    cause 12 is on the other side of the =
  5. Jan 7, 2010 #4


    User Avatar
    Science Advisor

    Then subtract 12 from both sides of the equation.
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