deletions | additions       diff --git a/untitled.tex b/untitled.tex  index 2c9e80a..61f622b 100644  --- a/untitled.tex  +++ b/untitled.tex 
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$\Leftrightarrow x^2+y^2 + Re((c+di)(x+yi))+b =0$ \\  $\Leftrightarrow x^2+y^2 + Re(cx+cyi+dxi+dyi^2)+b=0$\\  $\Leftrightarrow x^2+y^2 + Re(cx-dy+i(dx+cy))+b=0$\\  $\Leftrightarrow x^2 +y^2 + cx-dy + b=0$ b=0$\\  $\Leftrightarrow (x^2+cx) +(y^2-dy) +b =0$\\