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1)

 If A and B are matrices and B= ABA-1 then the value of (A+B) (A-B) is 


A) A2+B2

B) A2B2

C) A+B

D) A-B

Answer:

Option B

Explanation:

 B= ABA-1(Given)

 But B= BAA-A

   ABA1=BAA1AB=BA

 Now   (A+B)(AB)=A2AB+BAB2

A2AB+BAB2[AB=BA]

   = A2B2