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Easy

Question

If A = open square brackets table row a b row b a end table close square brackets and A2 = open square brackets table row alpha beta row beta alpha end table close square brackets, then

  1. alpha = 2ab, beta = a2 + b2    
  2. alpha = a2 + b2beta = ab    
  3. alpha = a2 + b2beta = 2ab    
  4. alpha = a2 + b2 ,beta = a2 – b2    

The correct answer is: alpha = a2 + b2beta = 2ab


    we are given A and A squared and asked to find α and β
    A squared space equals A space A space equals space open square brackets table row a b row b a end table close square brackets open square brackets table row a b row b a end table close square brackets
A squared space equals space open square brackets table row cell a squared plus b squared end cell cell a b plus b a end cell row cell b a plus a b end cell cell a squared plus b squared end cell end table close square brackets space equals space open square brackets table row alpha beta row beta alpha end table close square brackets
alpha space equals space a to the power of 2 space end exponent plus b squared
beta space equals space 2 a b space

    Therefore the correct option is choice 3

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