Answer
Explanation given below.
Work Step by Step
We write the vector in component form.
${\bf u}$=$\langle u_{1}, u_{2}, u_{3}\rangle\qquad $ or $\langle u_{1}, u_{2}\rangle$, if in two dimensions
The magnitude of the vector is its length,
$|{\bf u}|=\sqrt{u_{1}^{2}+u_{2}^{2}+u_{3}^{2}}$
and the direction of the vector is the unit vector (vector of magnitude 1, in the direction of ${\bf u}$):
$\displaystyle \frac{{\bf u}}{|{\bf u}|}=\frac{1}{\sqrt{u_{1}^{2}+u_{2}^{2}+u_{3}^{2}}}\cdot\langle u_{1}, u_{2}, u_{3}\rangle$
