Problem 1954. Write a cubic formula function

Create a function that will output the three roots of a cubic equation specified by the 4 coefficients listed as input. The output should be sorted using the "sort" function of matlab, to be consistent. Also, the output need only be accurate to the 4th decimal place, and the input "A" will always be non-zero and real.


A*x^3+B*x^2+C*x+D=0 --> [A,B,C,D]

x^3-6x^2+11x-6=0 --> [1,-6,11,-6]

cubicFormula([1,-6,11,-6]) --> [1,2,3]

Solution Stats

14.43% Correct | 85.57% Incorrect
Last solution submitted on Sep 08, 2016

Problem Comments

Discover MakerZone

MATLAB and Simulink resources for Arduino, LEGO, and Raspberry Pi

Learn more

Discover what MATLAB® can do for your career.

Opportunities for recent engineering grads.

Apply Today

MATLAB Academy

New to MATLAB?

Learn MATLAB today!

Join the 15-year community celebration.

Play games and win prizes!

Learn more