- #1
sassie
- 35
- 0
Homework Statement
Let a sequence (x(n)) by x1 = 0 and x(n+1) =[1 + 2x(n) − x^2(n)]/3
Show it converges.
Homework Equations
The Attempt at a Solution
Prove bounded above and is increasing. i.e. x(n)<x(n+1)<1
base case: 0<1/3<1
k+1 case: not very sure - i know that i will need to use the squeeze theorem, but I'm stuck on how the k+1 case expression will look like and what to use squeeze on.
i get x(k+2) being [14-8x(k)-4x^2(k)-4x^3(k)+x^4(k)]/27
do i need to use this to show x(k+1)<x(k+2)<1 ? then what do i use squeeze on? how do I show this is the case? I'm really stuck, any hints would be greatly appreciated! :)