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Homework Help: Multivariable Calculus - Sphere

  1. Sep 11, 2010 #1
    1. The problem statement, all variables and given/known data

    Find the equation of the sphere centered at (-7,6,7) with radius 2. Normalize your equations so that the coefficient of x^2 is 1.

    2. Relevant equations
    (x-xo)^2 + (y-yo)^2 + (z-zo)^2=r

    3. The attempt at a solution

    (x-(-7))^2 + (y-6)^2 + (z-7)^2 = 2

    it saids to normalize my equation.... and i do not understand what that means.
  2. jcsd
  3. Sep 11, 2010 #2


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    Homework Helper

    Check the equation. It is not right.

  4. Sep 11, 2010 #3
    oops i forgot the r^2 in n e case the formula is not my problem, im having troubles understandanding the last part of the question.
  5. Sep 11, 2010 #4


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    Homework Helper

    The coefficient of x^2 is 1 already, as (x+7)^2= x^2 + 14x + 49.

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