Question

5a -b
IfA=
3 2
and A adj A = A AT, then 5a + b is equal to :
(1) 13
(2)-1
(3) 5​

Answer 1

Answer:

hlo

Step-by-step explanation:

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Answer 2

Answer:

5

Step-by-step explanation:

         

A   =   ║ 5a   -b

             3      2║

adj A = ║ 2    b

               -3  5a║

At  = ║  5a  3

         -b  2   ║

   A adj A = AAt

 ⇒║  2    b      =        ║  5a  3

       -3   5a   ║           -b  2 ║

 corresponding elements of equal matrix  are

⇒  5a = 2   and  b=3

putting the value in given equation .we get  

5a + b = 2 +  3  = 5

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