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Question

All the elements in a matrix A are complex numbers with imaginary parts not equal to zero. If A is the conjugate of the matrix A, aij is the general element of matrix A, then what is the general element of the matrix, A+A2.

A
2lm(aij)
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B
lm(aij)
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C
Re(aij)
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D
Re(aij)2
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Solution

The correct option is C Re(aij)

By taking complex conjugate of a matrix we reverse the sign of imaginary parts of all the elements in the original matrix. i.e., if the element in A is x + iy, then the corresponding element in A is x - iy.
So when A and A is added the imaginary parts cancel out and the sum becomes 2 times the real part of element in A.
i.e., since (aij) is general element in A, the general element in A+A becomes 2Re(aij).
General element in A+A2=Re(aij).


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