Question

A function $f$ is defined by$f\left(x\right)=2x-5$ . Write down the values of
$$\begin{gathered} \left(i\right)f\left(0\right) \\ \left(ii\right)f\left(7\right) \\ \left(iii\right)f\left(-3\right) \end{gathered}$$

Answer 1

Hint: In this question we simply use putting the values and getting the results.

Now given that,
$f\left(x\right)=2x-5$
Now putting the different values of $x$ in $f\left(x\right)$
$$\begin{gathered} \left(i\right)f\left(0\right)=2\times 0-5 \\ =0-5 \\ =-5 \\ \left(ii\right)f\left(7\right)=2\times 7-5 \\ =14-5 \\ =9 \\ \left(iii\right)f\left(-3\right)=\left(2\times -3\right)-5 \\ =-6-5 \\ =-11 \end{gathered}$$
Note: These types of questions can be solved by simply putting the different values of $x$ in the given function and thus we will get the different values of $f\left(x\right)$ for different values of $x$ .