 
 
 
23.3.4  Numeric roots of a polynomial
The proot
command numerically finds the roots of a squarefree polynomial.
- 
proot takes
P, a squarefree polynomial, either in symbolic form or as a list
of polynomial coefficients (written by decreasing order).
- proot(P) returns a list of the
numeric roots of P.
Examples
Find the numeric roots of P(x)=x3+1.
or:
|  | | |  | ⎡ ⎣
 | −1.0,0.5−0.866025403784 i,0.5+0.866025403784 i | ⎤ ⎦
 | 
 |  |  |  |  |  |  |  |  |  |  | 
 | 
Find the numeric roots of x2−3.
or:
|  | | |  | ⎡ ⎣
 | −1.73205080757,1.73205080757 | ⎤ ⎦
 | 
 |  |  |  |  |  |  |  |  |  |  | 
 | 
 
 
