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Question
If matrix A = [1 2 3], write AAT.
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Solution
\[Given: A = \begin{bmatrix}1 & 2 & 3\end{bmatrix} \]
\[ A^T = \begin{bmatrix}1 \\ 2 \\ 3\end{bmatrix}\]
\[A A^T = \begin{bmatrix}1 & 2 & 3\end{bmatrix}\begin{bmatrix}1 \\ 2 \\ 3\end{bmatrix}\]
\[ \Rightarrow A A^T = 1 + 4 + 9\]
\[ \Rightarrow A A^T = 14\]
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