You can't "evaluate" without an x-value. Maybe they mean for you to express in a simplified form...? (No wonder you're confused!)
Since they didn't give you an x-value at which to evaluate, but did specify that x is less than -2, then take a look at the absolute-value portion of the expression. If x < -2, then what can you say about the sign of x + 2? (Hint: Take the inequality they've given you, and add two to each side. What does the result tell you?)
If the insides of an absolute value are negative, what must you do when you take the absolute-value bars off? Take the bars off, and do this.
Now simplify. What do you get?
You should get a numerical value....