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BITSAT2014MathematicsMatricesActual

If [ array cc & & - array ] is square root of identity matrix of order 2 then -

Options

  1. A1+ ²+ =0
  2. B1+ ²- =0
  3. C1- ²+ =0
  4. D²+ =1

Correct answer

D. ²+ =1

Step-by-step solution

[ array cc & & - array ]= I ₂ ; [ array lc & & - array ] [ array cc & & - array ]= [ array cc 1 & 0 0 & 1 array ] ²+ =1

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