Welch Li
01/23/2024 · Elementary School
3. Soit \( g(x)=x^{4}-5 x^{2}+4 \) a) Factoriser \( t^{2}-5 t+4 \) b) En-déduire que \( g(x)=\left(x^{2}-1\right)\left(x^{2}-4\right) \) 4. Soit \( h(x)=\frac{f(x)}{g(x)} \) a) Déterminer l'ensemble de définition \( D \) de \( h \). b) Montrer que pour tout \( x \) de \( D h(x)=\frac{x-3}{x^{2}+3 x+2} \) c) Résoudre dans \( \mathbb{R} \) l'inéquations \( h(x) \geq 1 \).
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**3. Soit \( g(x) = x^{4} - 5x^{2} + 4 \)**
a) **Factoriser \( t^{2} - 5t + 4 \)**
\[
t^{2} - 5t + 4 = (t - 1)(t - 4)
\]
b) **En déduire que \( g(x) = \left(x^{2} - 1\right)\left(x^{2} - 4\right) \)**
\[
g(x) = (x^{2} - 1)(x^{2} - 4) = (x - 1)(x + 1)(x - 2)(x + 2)
\]
**4. Soit \( h(x) = \frac{f(x)}{g(x)} \)**
a) **Déterminer l'ensemble de définition \( D \) de \( h \)**
\[
D = \mathbb{R} \setminus \{ -2, -1, 1, 2 \}
\]
b) **Montrer que pour tout \( x \) de \( D \), \( h(x) = \frac{x - 3}{x^{2} + 3x + 2} \)**
\[
h(x) = \frac{x - 3}{x^{2} + 3x + 2}
\]
c) **Résoudre dans \( \mathbb{R} \) l'inéquation \( h(x) \geq 1 \)**
\[
x \in \, ] -2, -1 [
\]
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