naschrift
$
\eqalign{
& 4x^2 - 16x + 4y^2 + 4y + 1 = 0 \cr
& 4x^2 - 16x + 4y^2 + 4y = - 1 \cr
& x^2 - 4x + y^2 + y = - \frac{1}
{4} \cr
& (x - 2)^2 - 4 + \left( {y - \frac{1}
{2}} \right)^2 - \frac{1}
{4} = - \frac{1}
{4} \cr
& (x - 2)^2 + \left( {y - \frac{1}
{2}} \right)^2 = 4 \cr}
$
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