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Math Help - determinant

  1. #1
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    determinant

    ahhhh
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  2. #2
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    Quote Originally Posted by needhelpsobad View Post
    ahhhh
    \left ( \begin{matrix} a & b \\ c & d \end{matrix} \right ) \cdot \left ( \begin{matrix} e & f \\ g & h \end{matrix} \right ) = \left ( \begin{matrix} ae + bg & af + bh \\ ce + dg & cf + dh \end{matrix} \right )

    \text{det} \left ( \begin{matrix} a & b \\ c & d \end{matrix} \right ) = ad - bc

    -Dan
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  3. #3
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    Quote Originally Posted by needhelpsobad View Post
    ahhhh
    For (c), you can use the equality in (b) to show that AB is singular since det(AB)=0.
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