Question

How do you find roots of a polynomial in MATLAB? (both ways)

a) roots() function and polyval() function
b) solve() function and fzero() function
c) polyroots() function and interp1() function
d) eig() function and quad() function

Answer 1

In MATLAB, roots of a polynomial can be found using the 'roots()' function for a direct approach or the 'fzero()' function when working with function handles, including polynomials.

Step-by-step explanation:

To find the roots of a polynomial in MATLAB, you can use either the roots() function which directly computes the roots of the polynomial represented by its coefficients, or the fzero() function which finds a root of a function defined by a MATLAB function handle, including polynomial functions. The solve() function from the Symbolic Math Toolbox can also be used for finding the roots symbolically, rather than numerically. Thus, the correct answer to the question is option (b): roots() function and fzero() function. The polyval() function is actually used to evaluate a polynomial at specific points, and not for finding roots. Options a, c, and d include functions that do not pertain to finding polynomial roots in the context provided.