evaluate 3x3 determinant
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Uploader Comments (robichaudd)
Top Comments
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I just want to understand why + - +
2 years ago 8
All Comments (104)
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@robichaudd thanks for such a nice video
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@dbnfsdf1006 one day the tooth fairy visit robichaudd and told her, " '+-+' !"
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thank you so much i love you!
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There is a lot simpler way to do 3x3. In this case you just do 3x7x-4 + 3x1x-1 + 3x7x5 - (-1)x7x3 - 5x7x3 - (-4)x7x3. Thats adding products from top left to bottom right all 3 diagonals and then subtracting from bottom left to top right all 3 diagonals
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@dbnfsdf1006 Because it makes a funny face when you put it that way
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lol....i just got that thing when i was in (class 5) x)
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its not working for all cases !
thx anyway :)
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thanks.
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The way they teach us here is so much less efficient
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I just love Math, when you spend 3:37 watching other people solve, and then they have a 0 for an answer at the end! LOL!
Thanks so much for the vid! Missed my class last week so I have to learn it "the easy way" through YouTube to survive our Final Exams tomorrow.
Thumbs up for you.
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my textbooks explains it but it is somehow the opposite of what you say, WHICH ONE WILL A BELIEVE?!?
Belmoth1 8 months ago
@Belmoth1 Your book probably expands around the first row instead of the first column. See my replies to poontang3zizo for more details. Either method will give the same answer. But check with your teacher to see if there's a preferred method.
robichaudd 8 months ago
Excuss me, you are going completely wrong direction here you should take first row as a coefficient not the column. This may screw a person's math test please delete this madness
juns1992 11 months ago 4
@juns1992 I've added an annotation in the video showing the sign pattern to use for whatever row or column you expand on. Hopefully this will clear up any confusion.
robichaudd 11 months ago 4