Upgrade to access all content for this subject

For which real numbers $x$ is $\begin{bmatrix} \frac{1}{2} \\\ \frac{1}{3} \\\ x \end{bmatrix}$ a unit vector?

Select ALL that apply.

$\dfrac{\sqrt{23}}{6}$

$\dfrac{25}{6}$

$-\dfrac{\sqrt{23}}{6}$

$-\dfrac{5}{6}$

$\dfrac{1}{6}$

$-\dfrac{1}{6}$