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Math Help - complete the square

  1. #1
    Junior Member
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    Perth
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    complete the square

    find the polar equation of the curve x^2+y^2=2cx by first completing the square.
    How do I complete the square?
    I have not done it in this form before?
    Thanks
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  2. #2
    Senior Member Peritus's Avatar
    Joined
    Nov 2007
    Posts
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    <br />
\begin{gathered}<br />
  x^2  - 2cx + \underbrace {c^2  - c^2 }_{} + y^2  = 0 \hfill \\<br />
  \left( {x - c} \right)^2  + y^2  = c^2  \hfill \\ <br />
\end{gathered} <br />
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