<apply> <times/> <ci>x</ci> <apply> <divide/> <apply> <times/> <apply> <minus/> <ci>c</ci> </apply> <apply> <times/> <apply> <minus/> <apply> <power/> <ci>b</ci> <cn>2</cn> </apply> <apply> <times/> <cn>4</cn> <ci>a</ci> <ci>c</ci> </apply> </apply> <cn>2</cn> </apply> </apply> <apply> <times/> <cn>2</cn> <ci>a</ci> </apply> </apply> </apply>