I have difficulty in answering accurately SAT math questions when I am under time pressure. I end up making careless mistakes. Is there anything you can suggest to me of how I can practice of not making these kinds of mistakes under pressure.

# The function f is defined by f(x)=(2x^2)-5. What are all possible values of f(x) where -2<x<2?

The function f is defined by f(x)=(2x^2)-5. What are all possible values of f(x) where -2<x<2?

I don't understand how to do this.