Find the indicated matrix.
-Let $A = \left[ \begin{array} { l l } - 5 & 2 \end{array} \right]$ and $B = \left[ \begin{array} { l l } 1 & 0 \end{array} \right]$. Find $3 A + 4 B$.
A) $\left[ \begin{array} { l l } - 15 & 4 \end{array} \right]$
B) $\left[ \begin{array} { l l } - 11 & 6 \end{array} \right]$
C) $\left[ \begin{array} { l l } - 9 & 4 \end{array} \right]$
D) $\left[ \begin{array} { l l } - 2 & 2 \end{array} \right]$

Question

Quizplus · Accepted Answer

First, multiply each matrix by its scalar: $3A = 3 \times \left[ \begin{array} { l l } - 5 & 2 \end{array} \right] = \left[ \begin{array} { l l } - 15 & 6 \end{array} \right]$ and $4B = 4 \times \left[ \begin{array} { l l } 1 & 0 \end{array} \right] = \left[ \begin{array} { l l } 4 & 0 \end{array} \right]$. Then, add the resulting matrices: $\left[ \begin{array} { l l } - 15 & 6 \end{array} \right] + \left[ \begin{array} { l l } 4 & 0 \end{array} \right] = \left[ \begin{array} { l l } - 11 & 6 \end{array} \right]$.

Find the Indicated Matrix A=[−52]A = \left[ \begin{array} { l l } - 5 & 2 \end{array} \right]A=[−5​2​]

Find the Indicated Matrix $A = \left[ \begin{array} { l l } - 5 & 2 \end{array} \right]$