Original: In numerical analysis , Newton 's method ( also known as the Newton Raphson method ) , named after Isaac Newton and Joseph Raphson , is perhaps the best known method for finding successively better approximations to the zeroes ( or roots ) of a real-valued function .
Simplified: In math , 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 .