# Math Help - Newton-Raphson

1. ## Newton-Raphson

The equation

$x^4 - x - 5 = 0$

has a root $\alpha$ between 1 and 2

show that the newton-raphson formula for finding the value of $\alpha$ can be written in the form

$x_{n+1} = \frac{3x^4_n+5}{4x^3_n-1}$

ok i simply don't know how it's done. but it's only worth 3 marks... :/

NOR do i know the formula!!!

2. Originally Posted by djmccabie
The equation

$x^4 - x - 5 = 0$

has a root $\alpha$ between 1 and 2

show that the newton-raphson formula for finding the value of $\alpha$ can be written in the form

$x_{n+1} = \frac{3x^4_n+5}{4x^3_n-1}$

ok i simply don't know how it's done. but it's only worth 3 marks... :/

NOR do i know the formula!!!