Wright Fuentes
01/27/2024 · Primary School

On considère la suite \( \left(u_{n}\right) \) définie par \[ u_{0}=-1, \forall n \in \mathbb{N}, u_{n+1}=-2 u_{n}+3 \] (1) Chercher l'unique point fixe \( \alpha \) de la fonction \( f(x)=-2 x+3 \). (2) Soit \( \left(v_{n}\right)_{\mathrm{n}} \) la suite définie par \( v_{\mathrm{n}}=u_{n}-\alpha \). (a) Montrer que ( \( \left.v_{n}\right) \) est une suite géométrique. (b) En déduire \( u_{n} \) en fonction de \( n \). (c) Que peut-on déduire quant à limite de la suite \( \left(u_{n}\right) \) ?

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(1) Le point fixe unique de la fonction \( f(x) = -2x + 3 \) est \( \alpha = 1 \). (2) La suite \( \left(v_n\right) \) est géométrique avec raison \( -2 \). \( u_n \) peut être exprimé comme \( u_n = -2^{n+1} + 1 \). La limite de la suite \( \left(u_n\right) \) est \( -\infty \).

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