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Math Help - radius of a circle

  1. #1
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    Unhappy radius of a circle

    Which is the radius of the circle x2 + y2 2(x + 3y) = 26
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  2. #2
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    \begin{array}{l}<br />
 x^2  + y^2  - 2\left( {x + 3y} \right) = 26 \\ <br />
 \left( {x^2  - 2x} \right) + \left( {y^2  - 6y} \right) = 26 \\ <br />
 \left( {x - 1} \right)^2  + \left( {y - 3} \right)^2  = 36 \\ <br />
 \end{array}
    Can you finish?
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