Question

if A is 2112 matrix then A adj A is ​

Answer 1

[010100]

B

[100010]

C

[110101]

D

[101110]

Answer

B

Solution

Let A=[3124]

We have

If A is a square matrix of order n then

A(adj A) = |A|.In

Here, n = 2

∴A(adjA)=I2|A|

=[1001][3124]=[1001](12−2)=10[1001]=[100010]

Answer 2

Answer:

MARK AS BRAINLIEST

A

−1

=

∣A∣

adjA

multiplying both sides with A gives

AA

−1

=

∣A∣

A(adjA)

∴A(adjA)=∣A∣I