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anonymous
 one year ago
ind the value of 6 3 5
5 7 6
3 9 9
anonymous
 one year ago
ind the value of 6 3 5 5 7 6 3 9 9

This Question is Closed

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.2determinant of this matrix?

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.2can you post a screenshot of the full thing?

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.2I'm confused what the full question is exactly

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0it's only missing the brackets

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.2ok so this? \[\Large \left\begin{array}{ccc} 6 & 3 & 5\\ 5 & 7 & 6\\ 3 & 9 & 9\\ \end{array}\right\]

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.2ok so this is a determinant

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.2have you learned that term?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I don't think i have

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.2dw:1443314924015:dw

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.2ok here is one method to do a determinant of a 3x3 matrix

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.2step 1) focus on the first two columns (circled) dw:1443315068425:dw

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.2copy those columns to the right of the matrix bar dw:1443315093066:dw keep the order the same

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.2we now have this extended matrix dw:1443315131877:dw

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.2step 2) draw diagonals that start at the top and face south east. I circled the terms eg: 6, 7 and 9 are the first group of terms dw:1443315174379:dw

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.2now multiply out the terms in each subgroup 6*7*9 = 378 3*(6)*3 = 54 5*5*9 = 225

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.2then add up the products 378+54+(225) = 549

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.2step 3) repeat the last step, but now we're going in the northeast direction dw:1443315369919:dw

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.2multiply out the subgroups 3*7*(5) = 105 9*(6)*(6) = 324 9*5*(3) = 135 add up the products 105+324+(135) = 84

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.2the sum from step 2 was 549 the sum from step 3 was 84 subtract the sums like so 54984 = 633 and that wraps up the problem

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.2It's a long process, but over time it should come easier with more practice

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0thank you so much, it really seems a bit complicated but im starting to understand :3 @jim_thompson5910

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.2this page has a similar example http://www.sparknotes.com/math/algebra2/systemsofthreeequations/section3.rhtml

DanJS
 one year ago
Best ResponseYou've already chosen the best response.0Isn't that the same thing as doing the scalar triple product

DanJS
 one year ago
Best ResponseYou've already chosen the best response.0volume of parallellpipedd

DanJS
 one year ago
Best ResponseYou've already chosen the best response.0spaned by the three vectors

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.2yes I think a 3x3 matrix determinant is involved somewhere in that

DanJS
 one year ago
Best ResponseYou've already chosen the best response.0vector cross product scalar triple product determinant dw:1443320363438:dw

DanJS
 one year ago
Best ResponseYou've already chosen the best response.0same thing, i just always remembered that way
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