Verify that the work performed along the segment (overline{P Q}) by the constant vector field (mathbf{F}=langle 2,-1,4angle)

Question:

Verify that the work performed along the segment $\overline{P Q}$ by the constant vector field $\mathbf{F}=\langle 2,-1,4angle$ is equal to $\mathbf{F} \cdot \overrightarrow{P Q}$ in these cases:
(a) $P=(0,0,0), Q=(4,3,5)$
(b) $P=(3,2,3), Q=(4,8,12)$

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