@inbook{10.4169/j.ctt5hh9sp.8,
ISBN = {9780883857830},
URL = {http://www.jstor.org/stable/10.4169/j.ctt5hh9sp.8},
abstract = {We derived Cardano’s formula for roots of reduced cubic polynomials in Section 3.2, only to discover that using it may require us to compute cube roots of complex numbers. This phenomenon arose in Exercise 3.12, when we tried to solve the cubic equation${y^3} - 7y + 6 = 0$. Our study of the discriminant in Section 3.4 revealed that this difficultywill occur whenever we work with a cubic whose roots are real and distinct. With that, we brought Chapter 3 to a close and turned to a study of complex numbers in Chapter 4. Now that we have learned how to use trigonometry to compute},
bookauthor = {Ron Irving},
booktitle = {Beyond the Quadratic Formula},
edition = {1},
pages = {109--142},
publisher = {Mathematical Association of America},
title = {Cubic Polynomials, II},
year = {2013}
}