Question

if A is a matrix
of order 3×3 and |A|=10, then |adjA| is​

Answer 1

Answer:

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Step-by-step explanation:

Consider the following identity A(adjA)=∣A∣I. Thus comparing it with the above equation gives us ∣A∣=10

Now ∣adjA∣=∣A∣  

n−1

 where n is the order of the square matrix.

Here 'n' is 3, therefore, ∣adjA∣=∣A∣  

3−1

=∣A∣  

2

=10  

2

=100.