“Cubic Polynomials.” Beyond the Quadratic Formula, by Ron Irving, 1st ed., Mathematical Association of America, 2013, pp. 47–72, www.jstor.org/stable/10.4169/j.ctt5hh9sp.6. Accessed 27 July 2021.
Irving, R. (2013). Cubic Polynomials. In Beyond the Quadratic Formula (pp. 47-72). Mathematical Association of America. Retrieved July 27, 2021, from http://www.jstor.org/stable/10.4169/j.ctt5hh9sp.6
Irving, Ron. "Cubic Polynomials." In Beyond the Quadratic Formula, 47-72. Mathematical Association of America, 2013. Accessed July 27, 2021. http://www.jstor.org/stable/10.4169/j.ctt5hh9sp.6.
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