Question

Sendo f(x) = x² -3 ,calcule x,de modo que -2 ≤ f(x) ≤ 6 

Answer 1

f (x)= x^2- 3
- 2 ≤ f(x) ≤ 6

-2 ≤ x^2-3 ≤ 6
-2+3 ≤ x^2 ≤ 6+3
1 ≤ x^2 ≤ 9
1 ≤ x ≤ 3