Find the indicated sum or difference, if it is defined.
-$\left[ \begin{array} { l l l } - 2 & 9 & 1 \end{array} \right] - \left[ \begin{array} { l l } 4 & 3 \end{array} \right]$
A) $\left[ \begin{array} { l l l } - 6 & 9 & - 2 \end{array} \right]$
B) not defined
C) $\left[ \begin{array} { l l l } - 6 & 6 & - 2 \end{array} \right]$
D) $\left[ \begin{array} { l l l } - 6 & 6 & 1 \end{array} \right]$

Question

Quizplus · Accepted Answer

The operation is not defined because the matrices have different dimensions. The first matrix is 1x3 and the second is 1x2.

Find the Indicated Sum or Difference, If It Is Defined [−291]−[43]\left[ \begin{array} { l l l } - 2 & 9 & 1 \end{array} \right] - \left[ \begin{array} { l l } 4 & 3 \end{array} \right][−2​9​1​]−[4​3​]

Find the Indicated Sum or Difference, If It Is Defined $\left[ \begin{array} { l l l } - 2 & 9 & 1 \end{array} \right] - \left[ \begin{array} { l l } 4 & 3 \end{array} \right]$