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I have another question!

Suppose a particles initial position is [tex]\vec{r_1} = 2\vec{i} + 5\vec{j} - \vec{k}[/tex] metres and its acted upon by a force [tex]\vec{F} = \vec{i} + \vec{j} + \vec{k}[/tex] newtons. Its final position is [tex]\vec{r_2} = -4\vec{i} + 3\vec{j} + \vec{k}[/tex]. Find the work done by [tex]\vec{F}[/tex].

Ok, i have the formula [tex]dW = \vec{F}.d\vec{r}[/tex] joules.

what is dr? is it simply the change in the position vector? How do I start this off?

Thankyou,