Chapter 6.6, Problem 3ES

A variable force $F\left(x\right)$ in Exercise $2$ , consider the distance $d$ for which the work done by the force on the particle when the particle moves from $x=0$ to $x=d$ is half of the work done when the particle moves from $x=0$ to $x=5$ . By inspecting the graph of $F$ , is $d$ more or less than $2.5$ ? Explain, and then find the exact value of $d$ .