Q2.    Compute the following:

        (i)    \begin{bmatrix} a &b \\ -b& a \end{bmatrix} + \begin{bmatrix} a &b \\ b& a \end{bmatrix}

Answers (1)

        (i)    \begin{bmatrix} a &b \\ -b& a \end{bmatrix} + \begin{bmatrix} a &b \\ b& a \end{bmatrix}

             = \begin{bmatrix} a+a &b+b \\ -b+b & a+a \end{bmatrix}

             = \begin{bmatrix} 2a &2b \\ 0 & 2a \end{bmatrix}

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