যদি A এবং B দুটি ম্যাট্রিক্স হয়, যাতে AB = B এবং BA = A, তাহলে A2 + B2 এর মান কত?

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UP TGT Mathematics 2021 Official Paper
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  1. 2AB
  2. 2BA
  3. A + B
  4. AB

Answer (Detailed Solution Below)

Option 3 : A + B
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UP TGT Hindi FT 1
125 Qs. 500 Marks 120 Mins

Detailed Solution

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ধারণা:

ম্যাট্রিক্সের সহযোগী বৈশিষ্ট্য় দ্বারা প্রদত্ত:

X (YZ) = (XY) Z ----(1)

প্রদত্ত:

AB = B এবং BA = A ----(2)

গণনা:

A2 + B2

⇒ AA + BB

⇒ A (BA) + B (AB) [(2) ব্যবহার করে]

⇒ (AB) A + (BA) B [(1) ব্যবহার করে]

⇒ BA + AB

⇒ A + B

তাই, A2 + B2 = A + B

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