Question 172401
when D, which is the discriminant , is less than zero you will get complex roots
:
{{{D=b^2-4ac}}} and a,b,and c are coefficients of a standard quadratic equation
:
{{{ax^2+bx+c=0}}}The reason why D<0 is complex is because you are taking the square root of D.....so naturally a square root of a negative number will be complex.
:
 x^2 + 5x + 7 = 0  would be and example

*[invoke quadratic "x", 1,5, 7]