a hasya kavi once said

Chaar laina sunaonga
Pasand aayi to theek hai
Nahi to chaar aur sunaounga

:-)


Discriminant is different from determinant.

Discriminant
The discriminant of the quadratic polynomial $a x^2 + b x + c$ is $b^2 - 4 a c$
Determinant
The determinant of a 2 × 2 matrix is $ \begin{vmatrix} a & b\\c & d \end{vmatrix} = ad-bc$