Question

Type the correct answer in the box. Use numerals instead of words. If necessary, use / for the fraction bar.

What is the output of the function f(x) = x + 21 if the input is 4?
When the input is 4, the output of f(x) = x + 21 is___

Answer 1

`f(x)=x+21\Longrightarrow f(4)=4+21=\boxed{25}`

Answer 2

When the input is 4, the output of f(x) = x + 21 is 25.

Explanation:

The given function is

`f(x)=x+21`

We need to find the output of the function if the input is 4. It meas we need to find the value of f(4).

Substitute x=4 in the given function.

`f(4)=(4)+21`

`f(4)=4+21`

After addition, we get

`f(4)=25`

When the input is 4, the output of f(x) = x + 21 is 25.

Therefore the required answer is 25.