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  • Compute the indicated products. (iii) [ 1 -2 2 3] [1 2 3 2 3 1]

Q3.    Compute the indicated products.

            (iii)    \begin{bmatrix} 1 & -2\\ 2 & 3 \end{bmatrix}\begin{bmatrix} 1 &2 &3\\ 2 & 3 & 1 \end{bmatrix}

Answers (1)

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            (iii) The multiplication can be performed as follows

    \begin{bmatrix} 1 & -2\\ 2 & 3 \end{bmatrix}\begin{bmatrix} 1 &2 &3\\ 2 & 3 & 1 \end{bmatrix}

               =\begin{bmatrix} 1\times 1+(-2)\times 2 & 1\times 2+(-2)\times 3&1\times 3+(-2)\times 1\\ 2\times 1+3\times 2 & 2\times 2+3\times 3&2\times 3+3\times 1 \end{bmatrix}

               =\begin{bmatrix} -3 & -4&1\\ 8 & 13&9 \end{bmatrix}

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seema garhwal

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