
I've managed to work out “$\vec{AM}$ in terms of $\mathbf a$ and $\mathbf b$” to be $3\mathbf a+\mathbf b$.
But how can I work out “$\vec{QB}$ in terms of $\mathbf c$”?

I've managed to work out “$\vec{AM}$ in terms of $\mathbf a$ and $\mathbf b$” to be $3\mathbf a+\mathbf b$.
But how can I work out “$\vec{QB}$ in terms of $\mathbf c$”?
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Hint find $\vec{AB}$ in terms of $\mathbf a$ and $\mathbf b$, then find $\vec{AQ}$ in terms of $\mathbf a$ and $\mathbf c$. Also find $\vec{AM}$ in terms of $\vec{AQ}$.