If A = \(\begin{pmatrix}-2&3 \\1 &1\end{pmatrix}\)then |A-1} = ?A. -5 – InterviewSolution

1.

If A = \(\begin{pmatrix}-2&3 \\1 &1\end{pmatrix}\)then |A-1} = ?A. -5 B. -1/5C. 1/25D. 25

Answer»

A = \(\begin{pmatrix}-2&3 \\1 &1\end{pmatrix}\)

│A│= -2-3 = -5

We know that │A^-1│= 1/|A|

=1/- 5

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