Find 5A. $$A = \left[ \begin{array} { l l }
4 & 9 \
4 & 7
\end{array} \right]$$
A) $\left[ \begin{array} { c c }
20 & 9 \
4 & 7
\end{array} \right]$
B) $\left[ \begin{array} { c c }
4 & 45 \
20 & 35
\end{array} \right]$
C) $\left[ \begin{array} { l l }
4 & 45 \
4 & 35
\end{array} \right]$
D) $\left[ \begin{array} { c c }
20 & 9 \
20 & 35
\end{array} \right]$
E) $\left[ \begin{array} { l l }
20 & 45 \
20 & 35
\end{array} \right]$

Question

Find 5A.  $$A = \left[ \begin{array} { l l } 
4 & 9 \
4 & 7
\end{array} \right]$$  
A) $\left[ \begin{array} { c c } 
20 & 9 \
4 & 7
\end{array} \right]$  
B) $\left[ \begin{array} { c c } 
4 & 45 \
20 & 35
\end{array} \right]$  
C) $\left[ \begin{array} { l l } 
4 & 45 \
4 & 35
\end{array} \right]$  
D) $\left[ \begin{array} { c c } 
20 & 9 \
20 & 35
\end{array} \right]$  
E) $\left[ \begin{array} { l l } 
20 & 45 \
20 & 35
\end{array} \right]$

Quizplus · Accepted Answer

To find $5A$, multiply each element of matrix $A$ by 5. Thus, $5 \times 4 = 20$, $5 \times 9 = 45$, $5 \times 4 = 20$, and $5 \times 7 = 35$.

Find 5A A=[4947]A = \left[ \begin{array} { l l } 4 & 9 \\4 & 7\end{array} \right]A=[44​97​]

Find 5A $A = \left[ \begin{array} { l l } 4 & 9 \\4 & 7\end{array} \right]$