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Exercises 7.3: Matrices

WRITING

1.
$\left[\begin{array}{cc}5& 6\\ 2& 1\end{array}\right]$

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2.
$\left(\begin{array}{ccc}2& -1& -1\\ 1& 2& 3\end{array}\right)$

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3.
$\left[\begin{array}{cc}0& 7\\ -3& 2\end{array}\right]$

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4.
$B=\left[\begin{array}{cc}4& 6\\ 3& 8\end{array}\right]$

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5.
$\left|\begin{array}{ccc}4& 1& 3\\ -2& -1& 1\\ 4& 0& 3\end{array}\right|$

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READING

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PROOFREADING

11.  $\left(\begin{array}{cc}1& -2\\ -3& 4\end{array}\right)$
⠠⠐⠣⠼⠁⠀⠐⠤⠼⠃⠠⠐⠜ ⠠⠐⠣⠐⠤⠼⠉⠀⠼⠙⠠⠐⠜
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12.  $D=\left[\begin{array}{cc}9& 0\\ -7& -9\end{array}\right]$
⠰⠠⠙⠀⠐⠶⠀⠠⠨⠣⠀⠀⠼⠊⠀⠀⠀⠼⠚ ⠀⠀⠀⠀⠀⠀⠀⠠⠨⠣⠐⠤⠼⠛⠀⠐⠤⠼⠊⠠⠨⠜
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13.  $\left|\begin{array}{cc}-5& 3\\ 4& 2\end{array}\right|$
⠠⠸⠳⠐⠤⠼⠑⠀⠼⠉⠠⠸⠳ ⠠⠸⠳⠼⠙⠀⠼⠃⠠⠸⠳
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14.  $\left[\begin{array}{cc}-9& -9\\ -2& -2\end{array}\right]$
⠨⠣⠐⠤⠼⠊⠀⠐⠤⠼⠊⠨⠜ ⠨⠣⠐⠤⠼⠃⠀⠐⠤⠼⠃⠨⠜
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15.  $\left[\begin{array}{cc}11& -5\\ 2& -1\end{array}\right]$
⠠⠨⠣⠼⠁⠁⠀⠐⠤⠼⠑⠨⠜ ⠠⠨⠣⠼⠃⠀⠀⠐⠤⠼⠁⠠⠨⠜
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