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DestisaurusRex
Group Title
How would you find the determinant of :
⎡3 2⎤
⎣6 4⎦ Without using a calculator?
 8 months ago
 8 months ago
DestisaurusRex Group Title
How would you find the determinant of : ⎡3 2⎤ ⎣6 4⎦ Without using a calculator?
 8 months ago
 8 months ago

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TheRealMeeeee Group TitleBest ResponseYou've already chosen the best response.1
ok 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
 8 months ago

TheRealMeeeee Group TitleBest ResponseYou've already chosen the best response.1
do this help
 8 months ago

GirlByte Group TitleBest 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
 8 months ago

TheRealMeeeee Group TitleBest ResponseYou've already chosen the best response.1
omg no idid not u just a stalker
 8 months ago

GirlByte Group TitleBest ResponseYou've already chosen the best response.0
Yes you did.You have the same words plus you did the same thing to the other questions.
 8 months ago

GirlByte Group TitleBest ResponseYou've already chosen the best response.0
And its obvious its not from you cause you dont even know basic grammar
 8 months ago

TheRealMeeeee Group TitleBest ResponseYou've already chosen the best response.1
omg girl no i didnt not stalker
 8 months ago

alekos Group TitleBest ResponseYou've already chosen the best response.1
she's right i'm afraid
 8 months ago

alekos Group TitleBest ResponseYou've already chosen the best response.1
leave maths to the real mathematicians
 8 months ago

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

alekos Group TitleBest ResponseYou've already chosen the best response.1
no calculator required. should be able to do it in your head
 8 months ago
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