Don't understand how to do this problem

Let f(x) = -. Simplify each of the following expressions. f ( 2 ) = f ( 2 + 1 ) = F ( 2 + h ) - f ( 2 ) = (Make sure to combine terms by getting a common denominator.) f ( 2 + h) - f( 2 ) _ (Make sure to cancel out the factor of h in the denominator.)