find commers rule for this![\left[\begin{array}{ccc}1&2&3\\4&5&6\\7&8&9\end{array}\right]](https://tex.z-dn.net/?f=++%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D1%26amp%3B2%26amp%3B3%5C%5C4%26amp%3B5%26amp%3B6%5C%5C7%26amp%3B8%26amp%3B9%5Cend%7Barray%7D%5Cright%5D+ "\left[\begin{array}{ccc}1&2&3\\4&5&6\\7&8&9\end{array}\right]")
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Well it is cramer's rule:
A=
=1(5*9 - 8*6)-2(4*9 - 7*6)+3(4*8 - 7*5)
= 45-48 - 2(36-42)+3(32-35)
= -3 -2(-6)+3(-3)
= -3+12-9
= 0
A=
=1(5*9 - 8*6)-2(4*9 - 7*6)+3(4*8 - 7*5)
= 45-48 - 2(36-42)+3(32-35)
= -3 -2(-6)+3(-3)
= -3+12-9
= 0
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