Apply Cardano's method to find the roots of $f(x) = x^3 − 6x + 4$
There was a part a) to this question with $f(x)=x^3 - 6x - 6$ which yielded a positive number under the square root using Cardano's method. I was able to get the real roots for that question.
The difference is in this cubic, when I used Cardano's method I got a negative under the square root implying complex roots.
I have $(-4 \pm 4i) / 2$ using Cardano's formula. I am not really sure where to go from here as I haven't done a Cardano problem of this type.
Thank you for any and all help.
