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$