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BUILT-IN MATHEMATICA SYMBOL

NRoots

yields a disjunction of equations which represent numerical approximations to the roots of a polynomial equation.

NRoots gives several identical equations when roots with multiplicity greater than one occur.

MaxIterations	Automatic	maximum number of iterations to use
Method	Automatic	method to use
PrecisionGoal	Automatic	the precision sought
StepMonitor	None	expression to evaluate at each step

Numerically find the roots of a polynomial:

Change the result to rules:

Test the roots:

Numerically find the roots of a polynomial:

Out[1]=

Change the result to rules:

Out[2]=

Test the roots:

Out[3]=