Question

For f(x)=2x, find f(9)

Answer 1

Explanation:

`f(9)` means we need to find the value of
`f(x)` when
`x=9`, so

`f(9)=2`×
`9=18`

Answer 2

Plug 9 for x

Equation:

2(9)

Solution

F(9)= 18