Hello i did not get this part on this example how they did this!matte3.bmp
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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.
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
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. $\displaystyle \left( {\begin{array}{*{20}c} {9a} \\ {9b} \\ {9c} \\ \end{array} } \right) - \left( {\begin{array}{r} {8a - 4b - 8c} \\ { - 4a + 2b + 4c} \\ { - 8a + 4b + 8c} \\ \end{array} } \right) =~ ?$
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