Question

If $\overrightarrow{P}\left(1,5,4\right)$ and $\overrightarrow{Q}\left(4,-1,-2\right)$. Find the direction ratio $\overrightarrow{PQ}$.

Answer 1

$\overrightarrow{PQ}=\overrightarrow{Q}-\overrightarrow{P}=(4-1)\hat{i}+(-1-5)\hat{j}+(-2-4)\hat{k}=3\hat{i}-6\hat{j}-6\hat{k}$

Direction Ratios are { 3, -6, -6}