Respuesta:
\begin{eqnarray*} (x - h)^2 + (y - k)^2 &=& r^2\\ x^2 - 2\,hx + h^2 + y^2 - 2\,ky + k^2 - r^2 &=& 0\\ x^2 + y^2 - 2\,hx - 2\,ky + h^2 + k^2 - r^2 &=& 0 \end{eqnarray*}
Explicación paso a paso:
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Respuesta:
\begin{eqnarray*} (x - h)^2 + (y - k)^2 &=& r^2\\ x^2 - 2\,hx + h^2 + y^2 - 2\,ky + k^2 - r^2 &=& 0\\ x^2 + y^2 - 2\,hx - 2\,ky + h^2 + k^2 - r^2 &=& 0 \end{eqnarray*}
Explicación paso a paso: