SCalc$83\mathrm{.}9\mathrm{.}503.$XP$.$MI$.$

Find the most general antiderivative of the function. $($Check your answer by differentiation. Use C for the constant of the antiderivative.$)$

f$($x$)=$

$4$x$3$

$+$

$3$x$8$

F$($x$)=$