ACT Mathematics Practice Test

Evaluating a function at a point means substituting the given input into the expression. For f(x) = x − 1/x, the input is 2, and the function is defined since 2 ≠ 0. So f(2) = 2 − 1/2. Writing 2 as 4/2 gives 4/2 − 1/2 = 3/2. Therefore, f(2) equals 3/2 (which is 1.5).