من المعادلة:
begin mathsize 18px style bold italic x to the power of bold 2 bold space bold space bold space bold minus bold space bold 16 bold space bold equals bold space bold 0 end style
نجد من المعادلة أن قيمة المميز begin mathsize 18px style bold left parenthesis bold space bold italic z bold space bold equals bold space bold italic b to the power of bold 2 bold space bold minus bold space bold 4 bold space bold italic a bold space bold italic c bold space bold right parenthesis end style تساوي:
begin mathsize 18px style bold italic z bold space bold equals bold space bold 0 end style
begin mathsize 18px style bold italic z bold space bold equals bold space bold 36 end style
begin mathsize 18px style bold italic z bold space bold equals bold space bold 16 end style
begin mathsize 18px style bold italic z bold equals bold space bold 64 end style