Question
If A = 
and A adj A = AAT, then 5a +b is equal to
-
-1
-
5
-
4
-
5
Solution
B.
5
Given, A =
and A adj A = AAT, Clearly, A (adj A) = |A|In|
Now, substituting the value of b in Eq. (iii) we get
5a = 2
Hence, 5a + b = 2 +3 = 5
