Find the Indicated Vector $\mathbf { u } = \left[ \begin{array} { r } 4 \\ - 7 \end{array} \right]$

Multiple Choice

Find the indicated vector.
-Let $\mathbf { u } = \left[ \begin{array} { r } 4 \\ - 7 \end{array} \right]$ . Find $7 \mathbf { u }$ .

A)
$\left[ \begin{array} { l } 28 \\ 49 \end{array} \right]$
B)
$\left[ \begin{array} { r } 28 \\ - 49 \end{array} \right]$
C)
$\left[ \begin{array} { l } - 28 \\ - 49 \end{array} \right]$
D)
$\left[ \begin{array} { r } - 28 \\ 49 \end{array} \right]$