1. Quelle est la solution de l'équation $x^2=9$ ?
2. Quelle est la solution de l'équation $x^2 = 16$ ?
3. Quelle est la solution de l'inéquation $x^2 \leq 9$ ?
Résolution $x^2=9
Solutions : $x=\pm 3$
Résolution $x^2=a$ — solutions?
$x= pm \pm \sqrt{a}$, $a ange 0, e 0$
Inéquation $x^2 \leq 9$
Solution : $x \in [-3, 3]$
Inéquation $x^2 ange a$ — solution?
$x ange [- extast{ oot{ ext a}}, oot{ ext a}]$
Signe de $x^2$
Positif sauf en 0, nul en 0
Signe de $x^2$ — quand?
Positif ou nul pour tout $x$
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