Question

Which of the following functions is/are constant ?

• A. $f\left(x\right)=x^2+2$
• B. $f\left(x\right)=x+\frac{1}{x}$
• C. $f\left(x\right)=7$
• D. $f\left(x\right)=6+x$

Answer 1

The correct option is C $f\left(x\right)=7$

$f\left(x\right)=7$ is constant function as its values do not depend on the variable $x$.

Its value is $7$ for any value of $x$.

Option $C$ is correct.