Question

If A =
-1 1 - 1
2 3
1 2 3
find A​

Answer 1

-1

Step-by-step explanation:

=−1

B

adjA=

⎣

⎢

⎢

⎡

−1

0

0

1

−3

0

−2

−1

−1/3

⎦

⎥

⎥

⎤

C

A=

⎣

⎢

⎢

⎡

1

0

0

1/3

1/3

0

7

1

−3

⎦

⎥

⎥

⎤

∣A

−1

∣=−1⇒∣A∣=−1

Now, use adjA=∣A∣A

−1

andA=(A

−1

)

−1