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Question: Answered & Verified by Expert
If A+B=212120022,AB=122110121 then A2+BA+B=
MathematicsMatricesTS EAMCETTS EAMCET 2022 (18 Jul Shift 2)
Options:
  • A 466342163
  • B 496332474
  • C 6108452496
  • D 344232042
Solution:
2536 Upvotes Verified Answer
The correct answer is: 466342163

Given,

A+B=212120022 & AB=122110121

Now we know that 

A+B2=A2+AB+BA+B2

A+B2-AB=A2+BA+B2

A+B2-AB=A2+BA+B

So A2+BA+B=A+B2-AB ...1

Now finding A+B2=212120022×212120022

A+B2=588452284

Now putting the value of A+B2 & AB in equation 1 we get,

A2+BA+B=588452284-122110121=466342163

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