Work performed by a constant force

An object moves in a straight line from position,

$\vec{r}_1 = 9\hat{x}-2\hat{y}-2\hat{z}$ [m],

to position,

$\vec{r}_2 = 3\hat{x}+8\hat{y}-3\hat{z}$ [m].

while a constant force,

$\vec{F} = 2\hat{x}-6\hat{y}-7\hat{z}$ [N].

is exerted on the object. What is the work performed by this force? (The work can be negative.)