Question
Question: If AB = I and B = A' then :...
If AB = I and B = A' then :
A
A–1 = A'
B
A–1 = A
C
A–1 = A2
D
None
Answer
A–1 = A'
Explanation
Solution
A . B = I Ž B = A–1
Also B = A' Ž A–1 = A'
If AB = I and B = A' then :
A–1 = A'
A–1 = A
A–1 = A2
None
A–1 = A'
A . B = I Ž B = A–1
Also B = A' Ž A–1 = A'