a) \(\begin{bmatrix}-4&0\\0&-4\end{bmatrix}\)
b) \(\begin{bmatrix}4&0\\1&4\end{bmatrix}\)
c) \(\begin{bmatrix}4&0\\0&4\end{bmatrix}\)
d) \(\begin{bmatrix}4&0\\0&-4\end{bmatrix}\)
If A=\(\begin{bmatrix}1&0\\9&4\end{bmatrix}\), then (adj A)A is ______________
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If A=\(\begin{bmatrix}1&0\\9&4\end{bmatrix}\), then (adj A)A is ______________
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