Question

Which function is always positive?

Answer 1

1. If a function $f\left(x\right)$ is positive, it means that for any value of $x$, the value of $f\left(x\right)$ will greater than zero.
2. Graphically, these functions will be present on only the positive side of the $y$-axis.
3. An example of such a function would be the exponential function, $f\left(x\right)=a^x$, where $a$ is a positive number.

Here, $a=1.5$ and $f\left(x\right)$ is a positive function.