Ask Experts Questions for FREE Help !
Ask
    lemon14's Avatar
    lemon14 Posts: 143, Reputation: 9
    Junior Member
    		  
    #1

    Dec 2, 2011, 01:00 AM
    How should I calculate the determinant?


    EDIT by Unknown008: Added the + signs.
    lemon14's Avatar
    lemon14 Posts: 143, Reputation: 9
    Junior Member
    		  
    #2

    Dec 2, 2011, 01:05 AM
    | -2a a+b a+c // b+a -2b b+c // c+a c+b -2c |

    I have problems with displaying the "+" sign every time I post. Is there a specific rule for writing expressions containing "+" ?
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
    Uber Member
    		  
    #3

    Dec 2, 2011, 03:23 AM
    You just need to type them in manually. That is after copy/pasting, you delete the + and retype them in and it should be fine I think.

    Otherwise, wikipedia has an article about that and the determinant is:

    (-2a)(-2b)(-2c) + (a+b)(b+c)(c+a) + (a+c)(b+a)(c+b) - (a+c)(-2b)(c+a) - (a+b)(b+a)(-2c) - (b+c)(c+b)(-2a)

    It's just like taking the diagonals:
    Longest diagonal towards down-right,
    Other diagonals going down-right and getting on the other side.

    Then subtracting the opposite diagonals.
    lemon14's Avatar
    lemon14 Posts: 143, Reputation: 9
    Junior Member
    		  
    #4

    Dec 5, 2011, 07:41 AM
    Sorry, it is my fault I didn't mention that I'm looking for another method (e.g. summing lines / columns or other operations) so that I can calculate it easier.

    Regarding the + I typed each of them manually.
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
    Uber Member
    		  
    #5

    Dec 5, 2011, 08:51 AM
    Barg, I don't know then... something to raise to the website developers, and it seems that they never took that seriously.

    Otherwise, sorry, I don't know of any other method :(
    lemon14's Avatar
    lemon14 Posts: 143, Reputation: 9
    Junior Member
    		  
    #6

    Dec 5, 2011, 01:18 PM
    OK, thank you anyway.
Not your question? Ask your question View similar questions
 

Question Tools Search this Question
Search this Question:

Advanced Search

Add your answer here.


Check out some similar questions!

Algebra 2 finding the determinant of a four by four matrices using ellimination. [ 1 Answers ]

How do you find the determinant of this four by four matrices by using ellimination? MY MATRICES: 0 -2 3 -4 -5 -6 7 -8 9 -10 11 -12 13 -14 -15 16 P.S I know how to find the determinant of a three by three and a two by two easily using ellimination,...

Determinant of interest rates [ 1 Answers ]

If real risk-free rate is 4 percent. Inflation is expected to be 2 percent this year and 5 percent during the next 2 years. Assuming that the maturity risk premium is zero. What is the yield on 2-year v.s. 3-year Treasury securities?

View more questions Search