# How do you calculate f(x) for the given domain values f(x) = 4x + 8; x = 1, 11, 21, 31, 101?

Aug 22, 2016

See the example

#### Explanation:

Picking just one of them as an example:

Given:$\text{ } \textcolor{b r o w n}{f \left(\textcolor{b l u e}{x}\right) = 4 \textcolor{b l u e}{x} + 8}$

$\textcolor{b r o w n}{\implies f \left(\textcolor{b l u e}{21}\right) = 4 \left(\textcolor{b l u e}{21}\right) + 8}$

$\implies f \left(21\right) = 84 + 8 = 92$

All you have to do is 'plug' the value in where $x$ is!