0008.qti

<item ident="M4-0008" title="M4 | Finding a matrix inverse | ver. 0008">
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  <presentation>
    <material>
      <mattextxml>
        <div class="exercise-statement">
          <p>
            <strong>M4.</strong>
          </p>
          <p>Show how to find the inverse of the matrix <img style="border:1px #ddd solid;padding:5px;border-radius:5px;" src="https://latex.codecogs.com/svg.latex?Q= \left[\begin{array}{cccc} -2 &amp; 5 &amp; 1 &amp; 8 \\ -1 &amp; 2 &amp; 6 &amp; 5 \\ -2 &amp; 1 &amp; 1 &amp; 7 \\ 1 &amp; -2 &amp; -1 &amp; -4 \end{array}\right]" alt="Q= \left[\begin{array}{cccc} -2 &amp; 5 &amp; 1 &amp; 8 \\ -1 &amp; 2 &amp; 6 &amp; 5 \\ -2 &amp; 1 &amp; 1 &amp; 7 \\ 1 &amp; -2 &amp; -1 &amp; -4 \end{array}\right]" title="Q= \left[\begin{array}{cccc} -2 &amp; 5 &amp; 1 &amp; 8 \\ -1 &amp; 2 &amp; 6 &amp; 5 \\ -2 &amp; 1 &amp; 1 &amp; 7 \\ 1 &amp; -2 &amp; -1 &amp; -4 \end{array}\right]" data-latex="Q= \left[\begin{array}{cccc} -2 &amp; 5 &amp; 1 &amp; 8 \\ -1 &amp; 2 &amp; 6 &amp; 5 \\ -2 &amp; 1 &amp; 1 &amp; 7 \\ 1 &amp; -2 &amp; -1 &amp; -4 \end{array}\right]"/>.</p>
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      <mattext texttype="text/html">&lt;div class="exercise-statement"&gt;
  &lt;p&gt;
    &lt;strong&gt;M4.&lt;/strong&gt;
  &lt;/p&gt;
  &lt;p&gt;Show how to find the inverse of the matrix &lt;img style="border:1px #ddd solid;padding:5px;border-radius:5px;" src="https://latex.codecogs.com/svg.latex?Q=%20%5Cleft%5B%5Cbegin%7Barray%7D%7Bcccc%7D%20-2%20&amp;amp;%205%20&amp;amp;%201%20&amp;amp;%208%20%5C%5C%20-1%20&amp;amp;%202%20&amp;amp;%206%20&amp;amp;%205%20%5C%5C%20-2%20&amp;amp;%201%20&amp;amp;%201%20&amp;amp;%207%20%5C%5C%201%20&amp;amp;%20-2%20&amp;amp;%20-1%20&amp;amp;%20-4%20%5Cend%7Barray%7D%5Cright%5D" alt="Q= \left[\begin{array}{cccc} -2 &amp;amp; 5 &amp;amp; 1 &amp;amp; 8 \\ -1 &amp;amp; 2 &amp;amp; 6 &amp;amp; 5 \\ -2 &amp;amp; 1 &amp;amp; 1 &amp;amp; 7 \\ 1 &amp;amp; -2 &amp;amp; -1 &amp;amp; -4 \end{array}\right]" title="Q= \left[\begin{array}{cccc} -2 &amp;amp; 5 &amp;amp; 1 &amp;amp; 8 \\ -1 &amp;amp; 2 &amp;amp; 6 &amp;amp; 5 \\ -2 &amp;amp; 1 &amp;amp; 1 &amp;amp; 7 \\ 1 &amp;amp; -2 &amp;amp; -1 &amp;amp; -4 \end{array}\right]" data-latex="Q= \left[\begin{array}{cccc} -2 &amp;amp; 5 &amp;amp; 1 &amp;amp; 8 \\ -1 &amp;amp; 2 &amp;amp; 6 &amp;amp; 5 \\ -2 &amp;amp; 1 &amp;amp; 1 &amp;amp; 7 \\ 1 &amp;amp; -2 &amp;amp; -1 &amp;amp; -4 \end{array}\right]"&gt;.&lt;/p&gt;
&lt;/div&gt;

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    <response_str ident="response1" rcardinality="Single">
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        <response_label ident="answer1" rshuffle="No"/>
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  </presentation>
  <itemfeedback ident="general_fb">
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          <div class="exercise-answer">
            <h4>Partial Answer:</h4>
            <p style="text-align:center;">
              <img style="border:1px #ddd solid;padding:5px;border-radius:5px;" src="https://latex.codecogs.com/svg.latex?Q^{-1}= \left[\begin{array}{cccc} -49 &amp; -13 &amp; -17 &amp; -144 \\ 4 &amp; 1 &amp; 1 &amp; 11 \\ 3 &amp; 1 &amp; 1 &amp; 9 \\ -15 &amp; -4 &amp; -5 &amp; -44 \end{array}\right]" alt="Q^{-1}= \left[\begin{array}{cccc} -49 &amp; -13 &amp; -17 &amp; -144 \\ 4 &amp; 1 &amp; 1 &amp; 11 \\ 3 &amp; 1 &amp; 1 &amp; 9 \\ -15 &amp; -4 &amp; -5 &amp; -44 \end{array}\right]" title="Q^{-1}= \left[\begin{array}{cccc} -49 &amp; -13 &amp; -17 &amp; -144 \\ 4 &amp; 1 &amp; 1 &amp; 11 \\ 3 &amp; 1 &amp; 1 &amp; 9 \\ -15 &amp; -4 &amp; -5 &amp; -44 \end{array}\right]" data-latex="Q^{-1}= \left[\begin{array}{cccc} -49 &amp; -13 &amp; -17 &amp; -144 \\ 4 &amp; 1 &amp; 1 &amp; 11 \\ 3 &amp; 1 &amp; 1 &amp; 9 \\ -15 &amp; -4 &amp; -5 &amp; -44 \end{array}\right]"/>
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        <mattext texttype="text/html">&lt;div class="exercise-answer"&gt;
  &lt;h4&gt;Partial Answer:&lt;/h4&gt;
  &lt;p style="text-align:center;"&gt;
    &lt;img style="border:1px #ddd solid;padding:5px;border-radius:5px;" src="https://latex.codecogs.com/svg.latex?Q%5E%7B-1%7D=%20%5Cleft%5B%5Cbegin%7Barray%7D%7Bcccc%7D%20-49%20&amp;amp;%20-13%20&amp;amp;%20-17%20&amp;amp;%20-144%20%5C%5C%204%20&amp;amp;%201%20&amp;amp;%201%20&amp;amp;%2011%20%5C%5C%203%20&amp;amp;%201%20&amp;amp;%201%20&amp;amp;%209%20%5C%5C%20-15%20&amp;amp;%20-4%20&amp;amp;%20-5%20&amp;amp;%20-44%20%5Cend%7Barray%7D%5Cright%5D" alt="Q^{-1}= \left[\begin{array}{cccc} -49 &amp;amp; -13 &amp;amp; -17 &amp;amp; -144 \\ 4 &amp;amp; 1 &amp;amp; 1 &amp;amp; 11 \\ 3 &amp;amp; 1 &amp;amp; 1 &amp;amp; 9 \\ -15 &amp;amp; -4 &amp;amp; -5 &amp;amp; -44 \end{array}\right]" title="Q^{-1}= \left[\begin{array}{cccc} -49 &amp;amp; -13 &amp;amp; -17 &amp;amp; -144 \\ 4 &amp;amp; 1 &amp;amp; 1 &amp;amp; 11 \\ 3 &amp;amp; 1 &amp;amp; 1 &amp;amp; 9 \\ -15 &amp;amp; -4 &amp;amp; -5 &amp;amp; -44 \end{array}\right]" data-latex="Q^{-1}= \left[\begin{array}{cccc} -49 &amp;amp; -13 &amp;amp; -17 &amp;amp; -144 \\ 4 &amp;amp; 1 &amp;amp; 1 &amp;amp; 11 \\ 3 &amp;amp; 1 &amp;amp; 1 &amp;amp; 9 \\ -15 &amp;amp; -4 &amp;amp; -5 &amp;amp; -44 \end{array}\right]"&gt;
  &lt;/p&gt;
&lt;/div&gt;

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