A particle is moved along the $x$-axis by a force which measures $\large\frac{10}{(1+x)^2}$ at a point $x$ feet from the origin.Find the work done (in ft-lb) in moving a particle from the origin to a distance of 9ft.

Question

$\begin{array}{1 1}9ft-lb\\8ft-lb\\12ft-lb\\5ft-lb\end{array}$