Question

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

Answer 1

$\left(i\right)$ Given: $f\left(x\right)=2x-5$
Evaluate value of function
Put $x=0$ in the given function.
$f\left(0\right)=2\left(0\right)-5=-5$
Therefore, value of $f\left(0\right)$ is $-5$

$\left(ii\right)$ Given: $f\left(x\right)=2x-5$
Evaluate value of function
Put $x=7$ in the given function.
$f\left(7\right)=2\left(7\right)-5=9$
Therefore, value of $f\left(7\right)$ is $9$

$\left(iii\right)$ Given: $f\left(x\right)=2x-5$
Evaluate value of function
Put $x=-3$ in the given function.
$f(-3)=2(-3)-5=-11$
Therefore, value of $f(-3)$ is $-11$