SolveDiscriminant

SolveDiscriminant[ expr, var ]

SolveDiscriminant[ expr, var ] calculates the discriminant that belongs to the given expr with respect to variable var.

Example in out
The discriminant of 3x^2 +4x +4 =8x^2. SolveDiscriminant[3x^2 +4x +4 =8x^2,x] 96