Question

{ if A is a square matsa of order 3 and lAl = 5
then the value of l 2A'l is​

Answer 1

Answer:

Step-by-step explanation:

25

Property: ∣adj A∣=∣A∣  

n−1

 where n is the order of the square matrix A.

Here, n=3 and ∣A∣=5

Therefore, ∣adj A∣=5  

2

=  

25

​  

 

or

Given A is a square matrix of order 3

then we know ∣2A∣=2  

3

∣A∣

                        =8∣A∣

given ∣A∣=4

then ∣2A∣=8∣A∣

        =8×4

        =32

Hence ∣2A∣=32.