Answers!
Hello Naveen
We have |A|, we need to find |A-1|
We know that
AA-1 = I
Taking determinant both sides
|A A-1| = |I|
Determinant of Identity Matrix (I) = 1
|A A-1| = 1
|A| |A-1| = 1
|A-1| = 1/|A|
|A-1| = 1/7
Comment
Answer the question...
Hello Naveen
We have |A|, we need to find |A-1|
We know that
AA-1 = I
Taking determinant both sides
|A A-1| = |I|
Determinant of Identity Matrix (I) = 1
|A A-1| = 1
|A| |A-1| = 1
|A-1| = 1/|A|
|A-1| = 1/7
Comment