# Iteration

The sequence of value given by the iterative formula is

X n+1=2/9-lnXn with initial value X=1,converges to alpha.

1) State an equation satisfied by alpha, and hence show that alpha is the x coordinate of a point on the curve where y=3.

2) Use this iterative formula to find alpha correct to 2 decimal places, showing each iteration.

Â© BrainMass Inc. brainmass.com March 4, 2021, 5:40 pm ad1c9bdddfhttps://brainmass.com/math/computing-values-of-functions/iteration-formula-sequence-5640

#### Solution Preview

Solution: Assume that this sequence of value given by the iterative formula x(n+1)=2/9-ln[x(n)] with initial value x=1, converges to alpha, using letter 'a' to represent alpha. ie., x(n)->a as n->infinity.

Then, according to the iterative formula x(n+1)=2/9-ln[x(n)], we let n approach infinity, we have

a=2/9-ln(a) (1)

So the limit of this sequence satisfy equation (1).

From (1) we can rewrite it as ...

#### Solution Summary

This provides a sequence given by an iterative formula, and shows how to find an equation satisfied by the convergence alpha and use the formula to find alpha.