Solve:

(1/2^x) > (1/x^2)

I don't know at what level you are studying this, but I have a suspicion that you have access to a graphing calculator.

Graph y = 1/2^x and y = 1/(x^2)
at x = 2 they intersect
and you should see another intersection at appr. -.75
Close in on that second intersection to get more accuracy

then x < appr. -.75 OR x > 2