Answer
See explanation below.
Work Step by Step
If $F(x)$ is an antiderivative of $f(x)$, so $F'(x)=f(x),$
then the indefinite integral of $f$ is
$\displaystyle \int f(x)dx=F(x)+C.$
This is not one function -- it is a collection of functions, separated by some constant. More information is needed to pinpoint C, which would give a particular solution.
The "indefinite" adjective highlights the fact that the antiderivative can be $ANY$ of the infinitely many functions of the form $F(x)+C.$
