What is the distance between $P(1, -2, 3)$ and $Q(4, 2, -1)$?

Explanation

1. 01

   $\overrightarrow{PQ} = 3\hat{i} + 4\hat{j} - 4\hat{k}$.

2. 02

   $\lvert \overrightarrow{PQ} \rvert = \sqrt{9 + 16 + 16} = \sqrt{41}$.