Question

X la patrat -4 < sau egal cu 0

Answer 1

x²-4≤0

(x-2)(x+2)≤0

.................................................

Conform imaginii =>

x∈[-2;2]

Answer 2

$x^2-4 \leq 0 \\ x^2 \leq 0+4 \\ x^2 \leq 4 \\ x \leq \sqrt{4} \\ x \leq 2$