Question

What is discriminant?

Answer

$\mathrm{For\; quadratic\; equation\; such\; as }a{x}^2+bx+c=0,\mathrm{ the\; quantity }{b}^2-4ac\mathrm{ is\; called\; the\; discriminant. }$
$\mathrm{If }{b}^2-4ac>0,\mathrm{the\; equation\; as\; real\; roots. }$
$\mathrm{If }{b}^2-4ac=0,\mathrm{the\; equation\; has\; coincidental\; real\; roots. }$
$\mathrm{If }{b}^2-4ac<0,\mathrm{the\; equation\; has\; complex\; roots.}$