Question 170718
D=b2- 4ac  if the discriminant is less than zero you will have complex roots.
:
where {{{ax^2+bx+c=0}}}


{{{x^2-10x+34=0}}}example of negative determinant
:
D=(-10)^2-4(1)(34)=-36 

solution 5+3i and 5-3i

*[invoke quadratic "x", 1, -10, 34]