a^2-2<; a
a^2-a-2<; 0
(a- 1/2)^2<; 9/4
A belongs to (-2,2), and because A.
When a is greater than or equal to 0, substitute the second function.
2/3a- 1 & lt; a
a & gt-3
And because a is greater than or equal to 0, a is greater than or equal to 0.
To sum up, A belongs to (-2,+infinity).