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)
$\left[ \begin{array} { r } - 28 \ 49 \end{array} \right]$

Question

Quizplus · Accepted Answer

To find $7 \mathbf { u }$, each component of $\mathbf { u }$ is multiplied by 7, resulting in $\left[ \begin{array} { r } 4 \times 7 \ - 7 \times 7 \end{array} \right] = \left[ \begin{array} { r } 28 \ - 49 \end{array} \right]$.

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

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