Maths-

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Easy

Question

# If A and B are square matrices such that AB = B and BA = A, then A^{2} + B^{2} is equal to-

- 2AB
- 2BA
- A + B
- AB

## The correct answer is: A + B

We are given that A and B are square matrices such that AB = B and BA = A and we are asked to find what A2 + B2 is equal to

Hence the correct answer is choice 3

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