I need to find all 2x2 matrices A,
such that A^2=I2, the 2x2 identity matrix.
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this means that A is equal to its inverse. So you may write the expression of and deduce 4 equations from the identification of it with A. It remains to solve these equations
Originally Posted by Snooks02 I need to find all 2x2 matrices A,
such that A^2=I2, the 2x2 identity matrix. Just to flesh out what tah said:
now, compute the matrix product on the left hand side, then equate corresponding components to get your 4 equations that tah spoke of. solve this system for your solution
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