Question

If f(x) = 3х – 15, what is f(4)?

Answer 1

`\huge{\boxed{f(4)=\bf{-3}}}`

In this case, you are replacing all instances of
`x` with
`4`.
`f(4)=3(4)-15`

Multiply.
`f(4)=12-15`

Subtract.
`f(4)=-3`