Question

Given f(x)=4x+5, evaluate f(4).

Answer 1

21

Explanation:

1. plug in 4 for F(x) making 4=x:

`f(4)=4(4)+5`

2. multiply 4 and 4:

`f(4)=4(4) +5`⇒
`f(4)=16+5`

3. Add 16 and 5 to get your answer:

`f(4)= 16+5`⇒
`f(4)=21`