Question

X patrat-9 mai mic 0

Answer 1

$x^{2} - 9 \leq 0\\(x-3)(x+3) \leq 0\\\text{Daca } f(x) = x^{2} - 9 \text{, G}_{f} - \text{parabola cu ramurile in sus}\\\implies\boxed{x \in [-3, 3]}$