Answer
$[-8\ \ -3\ \ 23]$
Work Step by Step
If $A$ is an $m\times\boxed{n }$ matrix and $B$ is an $\boxed{n }\times k$ matrix,
then the product $AB$ is the $m\times k$ matrix whose $ij-$th entry is the product
$(AB)_{ij}=[a_{i1}\ a_{i2}\ a_{i3}\ \ldots\ a_{in}]\left[\begin{array}{l}
b_{1j}\\
b_{2j}\\
b_{3j}\\
\vdots\\
b_{nj}
\end{array}\right]$
$=a_{i1}b_{1j}+a_{i2}b_{2j}+a_{i3}b_{3j}+\cdots+a_{in}b_{nj}$.
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Here,
A is a $1\times 4$ matrix, B is a $4\times 3$ matrix
AB is defined, and is a $1\times 3$ matrix.
$(AB)_{11}=0(1)+1(0)-1(6)+2(-1)=-8$
$(AB)_{12}=0(-2)+1(1)-1(0)+2(-2)=-3$
$(AB)_{13}=0(1)+1(3)-1(2)+2(11)=23$
$AB=[-8\ \ -3\ \ 23]$
