How to solve and plot a cubic equation in matlab

Question

I am pretty new with matlab, and right now I am a bit lost. I want to solve the following cubic equation and then plot both real and imaginary roots:

x^3-d*(x^2)+1 =0

Where l is a parameter between [-10 10] and x[-5 5]. Thank you

Answer 1

Is it always going to be?

y=x^3-d*(x^2)+1 ?

If so, you can use the roots function

y = roots([1, -d, 0, 1]);

Where the vector is the equation's coefficients