## Calculus (3rd Edition)

$$\overrightarrow{PQ}= \langle -4,1\rangle$$ $$\|\overrightarrow{PQ}\|= \sqrt{17}$$
$$\overrightarrow{PQ}=Q-P=(-3,5)-(1,4)=\langle -4,1\rangle$$ and moreover, the length is given by $$\|\overrightarrow{PQ}\|=\sqrt{(-4)^2+1^2}=\sqrt{17}$$