Question

• function notation•
these are so confusing

Answer 1

15

Explanation:

Just substitute the x for 5
In this case:

Original function: f(x) =
`x^(2)` - 2x

Substitute function: f(5) =
`(5)^(2)` - 2(5)

Now solve for the substitute function


`(5)^(2)` - 2(5)

25 - 10

15

Therefore, f(5) is equal to 15