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Math Help - Matrice

  1. #1
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    Matrice

    Hello i did not get this part on this example how they did this!matte3.bmp
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  2. #2
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    Re: Matrice

    Quote Originally Posted by Petrus View Post
    Hello i did not get this part on this example how they did this!matte3.bmp
    Multiply both sides by 9. See what happens.
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    Re: Matrice

    Quote Originally Posted by Plato View Post
    Multiply both sides by 9. See what happens.
    so idk really what im doing wrong.. well i dont get it why all - gets + and + gets - i did not get it :S
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    Re: Matrice

    Quote Originally Posted by Petrus View Post
    so idk really what im doing wrong.. well i dont get it why all - gets + and + gets - i did not get it :S
    Oh, come on. Do some thinking for yourself.

    \left( {\begin{array}{*{20}c}   {9a}  \\   {9b}  \\   {9c}  \\ \end{array} } \right) - \left( {\begin{array}{r}   {8a - 4b - 8c}  \\   { - 4a + 2b + 4c}  \\   { - 8a + 4b + 8c}  \\ \end{array} } \right) =~ ?
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