Find the indicated matrix.
-Let $A = \left[ \begin{array} { r r r } 3 & - 2 & 1 \ 0 & 4 & - 2 \end{array} \right]$ and $B = \left[ \begin{array} { r r } 3 & 0 \ - 2 & 1 \end{array} \right]$. Find $A B$.
A) $\left[ \begin{array} { r r } 9 & - 6 \ - 6 & 8 \ 3 & - 4 \end{array} \right]$
B) $\left[ \begin{array} { l l } 9 & 0 \ 0 & 4 \end{array} \right]$
C) $\left[ \begin{array} { r r r } 9 & - 6 & 3 \ - 6 & 8 & - 4 \end{array} \right]$
D) not defined

Question

Quizplus · Accepted Answer

Matrix multiplication is not defined for matrices $A$ and $B$ because the number of columns in $A$ (which is 3) does not match the number of rows in $B$ (which is 2).

Find the Indicated Matrix A=[3−2104−2]A = \left[ \begin{array} { r r r } 3 & - 2 & 1 \\ 0 & 4 & - 2 \end{array} \right]A=[30​−24​1−2​]

Find the Indicated Matrix $A = \left[ \begin{array} { r r r } 3 & - 2 & 1 \\ 0 & 4 & - 2 \end{array} \right]$