(a)[1]
Write $\overrightarrow{AB}$ using $a$ and $b$.
(b)[2]
Show that $\overrightarrow{OC} = 8b-3a$.
(c)[1]
$\overrightarrow{AD}=k\overrightarrow{OC}$. Find the value of $k$ in this relation.
Mathematics 4024 · O Level · Vector geometry
Vector geometry — practice question
The diagram shows $\overrightarrow{OA}=a$, $\overrightarrow{OB}=2b$ and $AB:BC=1:3$. $OBD$ is a straight line.