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a hasya kavi once said

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

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Discriminant is different from determinant.

Discriminant

The discriminant of the quadratic polynomial $a x^2 + b x + c$ is $b^2 - 4 a c$

More info at https://en.wikipedia.org/wiki/Discriminant

Determinant

The determinant of a 2 × 2 matrix is $ \begin{vmatrix} a & b\\c & d \end{vmatrix} = ad-bc$

More info at https://en.wikipedia.org/wiki/Determinant

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