Upgrade to access all content for this subject

Find $x$ such that $\left\Vert \begin{bmatrix} x-1\\\ 2x\\\ 1\end{bmatrix}\right\Vert = 3$.

Select ALL that apply.

$1$

$-1$

$\dfrac{7}{5}$

$\dfrac{3}{5}$

$\dfrac{7}{4}$

$-\dfrac{3}{4}$