10217

# Parameters for Plotting a Cubic Polynomial

A cubic polynomial is normally characterized by the coefficients However, these coefficients are not well suited to describe the geometrical shape of the graph of the cubic. Nickalls found a set of parameters that do a better job. The relation between the parameter sets is given in the Details section.
The parameters define the plot range and .

### DETAILS

The point of inflection N (turning point) has coordinates and . The other two parameters are given by and . The horizontal and vertical distances from N to the minimum are and . But note that Nickalls's parameters and become complex if . The slope at the point of inflection is given by .
A detailed discussion of the parameters is given in:
R. W. D. Nickalls, "A New Approach to Solving the Cubic: Cardan's Solution Revealed," The Mathematical Gazette, 77(480), 1993 pp. 354–359.

### PERMANENT CITATION

 Share: Embed Interactive Demonstration New! Just copy and paste this snippet of JavaScript code into your website or blog to put the live Demonstration on your site. More details » Download Demonstration as CDF » Download Author Code »(preview ») Files require Wolfram CDF Player or Mathematica.

#### Related Topics

 RELATED RESOURCES
 The #1 tool for creating Demonstrations and anything technical. Explore anything with the first computational knowledge engine. The web's most extensive mathematics resource. An app for every course—right in the palm of your hand. Read our views on math,science, and technology. The format that makes Demonstrations (and any information) easy to share and interact with. Programs & resources for educators, schools & students. Join the initiative for modernizing math education. Walk through homework problems one step at a time, with hints to help along the way. Unlimited random practice problems and answers with built-in Step-by-step solutions. Practice online or make a printable study sheet. Knowledge-based programming for everyone.