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 one year ago
How would you find the determinant of :
⎡3 2⎤
⎣6 4⎦ Without using a calculator?
 one year ago
How would you find the determinant of : ⎡3 2⎤ ⎣6 4⎦ Without using a calculator?

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TheRealMeeeee
 one year ago
Best ResponseYou've already chosen the best response.1ok You actually do it the same way for any size matrix: you pick a row and column, and multiply the value for each element in the row by the "cofactor" or "minor" (the smaller determinant found by eliminating the row and the column of the element that you're working with).  5 2 0 0 2   0 1 4 3 2   0 0 2 6 3   0 0 3 4 1   0 0 0 0 2  This particular matrix is pretty easy, because it has a lot of zeros. So if you start with the last row, you get: 2 x  5 2 0 0   0 1 4 3   0 0 2 6   0 0 3 4  Then, using the first column, you'd get: 2 x 5 x  1 4 3   0 2 6   0 3 4  Then again using the first column: 2 x 5 x 1 x  2 6   3 4  2 x 5 x 1 x (2 x 4  3 x 6) = 100

GirlByte
 one year ago
Best ResponseYou've already chosen the best response.0@DestisaurusRex lol do not listen to this guy ^^^ he copies answers! he got it from here http://answers.yahoo.com/question/index?qid=20070123154335AAIVKZd

TheRealMeeeee
 one year ago
Best ResponseYou've already chosen the best response.1omg no idid not u just a stalker

GirlByte
 one year ago
Best ResponseYou've already chosen the best response.0Yes you did.You have the same words plus you did the same thing to the other questions.

GirlByte
 one year ago
Best ResponseYou've already chosen the best response.0And its obvious its not from you cause you dont even know basic grammar

TheRealMeeeee
 one year ago
Best ResponseYou've already chosen the best response.1omg girl no i didnt not stalker

alekos
 one year ago
Best ResponseYou've already chosen the best response.1leave maths to the real mathematicians

alekos
 one year ago
Best ResponseYou've already chosen the best response.1for a 2x2 determinant \[\left[\begin{matrix}a & b \\ c & d\end{matrix}\right]\] it's ad  bc

alekos
 one year ago
Best ResponseYou've already chosen the best response.1no calculator required. should be able to do it in your head
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