Question

Given `f(x)=x-4`, how do you find f(1)?

Answer 1

`f(color(red)1) = color(red)1-4 = -3`

Explanation:

When the function starts as `f(x)` it means that the expression which follows has `x` terms in it.

`f(1)` means that where there WAS an `x`, there is NOW the value `1`.

"Find, determine, evaluate, calculate" all mean just substitute the 1 in place of `x` in the expression and work out the value.

`f(color(red)x) = color(red)(x)-4`

`f(color(red)1) = color(red)1-4 = -3`

`f(color(red)2) = color(red)2-4 = -2`

`f(color(red)5) = color(red)5-4 = 1`

`f(color(red)m) = color(red)m-4` etc...