Question 36426
If discriminant is >0 the quadratic has two Real Number roots.
If discriminant is 0 the quadratic has two equal rational roots.
If discriminant is <0 the quadratic has two imaginary roots.

Example:
y=ax^2+bx+c
If a=1,b=1,c=-2 the quadratic has two real number roots, as follows:
*[invoke quadratic "x",1,1,-2]
Hope this helps.
Cheers,
Stan H.