Answer:
5 < x < 11
Explanation:
The third side of the triangle, x, should satisfy the following equations:
3 + 8 > x
3 + x > 8
8 + x > 3
Simplifying, we get x < 11 from the first equation. We also get 5 < x from the second equation and -5 < x. Since 5 is larger than -5, we take the more inclusive one, which is 5 < x (because 5 < x includes -5, while -5 < x doesn't include 5.)
Combining the two, we get 5 < x < 11.