Matrice

**Petrus** · January 7th 2013, 02:45 PM

Hello i did not get this part on this example how they did this!matte3.bmp

**Plato** · January 7th 2013, 02:52 PM

Originally Posted by Petrus

Hello i did not get this part on this example how they did this!matte3.bmp

Multiply both sides by 9. See what happens.

**Petrus** · January 7th 2013, 03:14 PM

Originally Posted by Plato

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

**Plato** · January 7th 2013, 03:32 PM

Originally Posted by Petrus

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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