We will solve (for X) the polynomial of the form:
+ cX + d = 0.
First input the rational coefficients for a, b, c, d.
(Click 'Next' when you're finished)
By dividing the coefficients by the value of 'a' we get,
We now transform the cubic by making the substitution Y=X+b/3 to put the polynomial in the form of Y3+pY+q = 0.
We can now calculate the discriminant
D = q2/4 + p3/27
We can now calculate the real root of Y3+pY+q = 0