how to write polynomial code

how to write a code that:

- Reads any polynomial P

- Finds its roots.

- Shows the degree of the polynomial.

- Calculates P^3 - Plots the polynomials P and P^3 on a suitable domain specified by the user

Answer 1

[Birdman]

syms x
p(x)=x^2+2*x-3;%as an example
Coeff=coeffs(p(x))';
Coeff=wrev(Coeff);
Roots=roots(Coeff);%roots
Degree=length(Coeff)-1;%degrees
disp(p^3)%calculates p^3
x=0:0.1:1;
plot(x,p(x));grid on;%plots

[Walter Roberson]

Note that wrev requires wavelet toolbox. You can use flipud() in this context.

[Birdman]

Thank you Walter, nice to learn.

[Ahmad Dalabeeh]

thank you very much brothers

Answer 2

[Krishan Kumar]

syms x p(x)=x^2+2*x-3;%as an example Coeff=coeffs(p(x))'; Coeff=wrev(Coeff); Roots=roots(Coeff);%roots Degree=length(Coeff)-1;%degrees disp(p^3)%calculates p^3 x=0:0.1:1; plot(x,p(x));grid on;%plots