Notice that,, and that if, then . Hence, and From the first equation, we find that is the equation of and is the equation of, by completing the square.
Mapapansin na ang,, At kung, At pagkatapos ay . Samakatuwid, at Mula sa unang equation, nakita namin na ay ang equation na at ay ang equation na, Sa pamamagitan ng pagkumpleto ng parisukat.