Saved Bookmarks
| 1. |
If │A│=3 and A-1 = \(\begin{pmatrix}3&-1 \\-5/ 3 &2/3\end{pmatrix}\)then adj A = ?A. \(\begin{pmatrix}9&3 \\-5 &-2\end{pmatrix}\)B.\(\begin{pmatrix}9&-3 \\-5 &2\end{pmatrix}\)C.\(\begin{pmatrix}-9&3 \\5 &-2\end{pmatrix}\)D. \(\begin{pmatrix}9&-3 \\5 &-2\end{pmatrix}\) |
|
Answer» -1= 1|A| adj A adj A = |A| x A-1 = 3 x \(\begin{pmatrix}3&-1 \\-5/ 3 &2/3\end{pmatrix}\) = \(\begin{pmatrix}9&-3 \\-5 &2\end{pmatrix}\) |
|