Editing Zero of a function (section)

== Computing roots ==
{{see also|Equation solving}}
There are many methods for computing accurate [[approximation]]s of roots of functions, the best being [[Newton's method]], see [[Root-finding algorithm]]. 

For [[polynomial]]s, there are specialized algorithms that are more efficient and may provide all roots or all real roots; see [[Polynomial root-finding]] and [[Real-root isolation]].

Some polynomial, including all those of [[degree of a polynomial|degree]] no greater than 4, can have all their roots expressed [[algebraic function|algebraically]] in terms of their coefficients; see [[Solution in radicals]].