Find the Product AB, If Possible $A=\left[\begin{array}{rrr}-2 & 7 & -7 \\ 5 & 9 & -5\end{array}\right], B=\left[\begin{array}{r}7 \\ -2 \\ -1\end{array}\right]$

question 37

Multiple Choice

Find the product AB, if possible.
- $A=\left[\begin{array}{rrr}-2 & 7 & -7 \\ 5 & 9 & -5\end{array}\right], B=\left[\begin{array}{r}7 \\ -2 \\ -1\end{array}\right]$

• A)\(\left[ \begin{array} { r } - 21 \\ 22 \end{array} \right]\)
• B) \(\mathrm { AB }\) is not defined.
• C) \(\left[ \begin{array} { l l } - 21 & 22 \end{array} \right]\)
• D)\(\left[ \begin{array} { r r r } - 2 & 7 & - 7 \\ 5 & 9 & - 5 \\ 7 & - 2 & - 1 \end{array} \right]\)

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