Error using root on complex polinomial

Hi everyone,

I got this error message and i can't figure it out, tryed a few times with different equations

z=x^2-1

works, but the following isn't working

syms x;
z=x^3+2*abs(x^2);
r=root(z,x);

Error using mupadengine/feval (line 163)
The first argument must be a polynomial or polynomial expression.

Error in sym/root (line 36)
    r = feval(symengine, 'RootOf', f, x);
    

I've got to use the R2015b version since it's the last 32bit build

Answer 1

[KALYAN ACHARJYA]

Its roots not root

Pass single variable roots(p)

[DANIEL MARTIN]

Using roots and passing only z it returns a 0x1 sym variable, does it means there ar no roots for that equation?