Question

If f(x) = [x] – 5, what is f(8.6)?
3
4
8
9

Answer 1

A. 3

Explanation:

Answer 2

Explanation:

The strange thing about the greatest integer function is that the number you are evaluating the function at is not actually the number unless its an integer. The rule is to round down, ALWAYS, if you are dealing with a value of x that is not an integer. In other words, you are NOT evaluating the function at 8.6, you have to round down to 8 and evaluate it there. 8 - 5 = 3