Chapter 4, Problem 21CR

To determine

To find: The value of function at $x=2$ and $x=7$

Answer to Problem 21CR

The values are $f\left(2\right)=-4$ and $f\left(7\right)=6$

Explanation of Solution

Given information:

Function $f\left(x\right)=2x-8$

To evaluate the values in given function take values one by one and substitute in given function,

  $\begin{array}{l}f\left(2\right)=2\left(2\right)-8\\ =4-8\\ =-4\end{array}$

And for value $x=7$ ,

  $\begin{array}{l}f\left(7\right)=2\left(7\right)-8\\ =14-8\\ =6\end{array}$

Therefore values are $f\left(2\right)=-4$ and $f\left(7\right)=6$