In numerical analysis , Newton 's method ( also known as the Newton-Raphson method ) , named after Isaac Newton and Joseph Raphson , is a method for finding successively better approximations to the roots ( or zeroes ) of a real-valued function .
In maths , Newton 's method ( also known as the Newton-Raphson method , named after Sir Isaac Newton and Joseph Raphson ) is a method for finding the zeroes ( or roots ) of a function whose values are all real .