Numeric roots of a polynomial : proot

proot takes as argument a squarefree polynomial, either in symbolic form or as a list of polynomial coefficients (written by decreasing order).
proot returns a list of the numeric roots of this polynomial.
To find the numeric roots of P(x) = x³ + 1, input :

proot([1,0,0,1])

or :

proot(x^3+1)

Output :

[0.5+0.866025403784*i,0.5-0.866025403784*i,-1.0]

To find the numeric roots of x² - 3, input :

proot([1,0,-3])

or :

proot(x^2-3)

Output :

[1.73205080757,-1.73205080757]