If A = \(\begin{bmatrix}3 & 6\\-1 & 2 \end{bmatrix}\), then what can be said about 12\( { A }^{ -1 } \)?
Answer & explanation
Correct answer: option 3
\( { A }^{ -1 } \) =\(\frac{adj A}{|A|}\)
But |A| = 12
So, \( { A }^{ -1 } \) =\(\frac{adj A}{12}\)
12 \( { A }^{ -1 } \) = 12 \(\frac{adj A}{12}\)
(adj A)