A sum in determinants...need help....

• Jun 10th 2012, 07:00 AM
rosariola
A sum in determinants...need help....
Code:

`|(a+b-c) (-c+a-b) (a+b+c) | |  (a-c)      (c-a)      (b-a)    |            = (a+b-c)(-c+a-b)(a-c) |  (a-b)      (a-c)      (a+b)  |`
using properties of determinants without expanding the determinant

I tried a lot of ways like with following steps C(3) -> C(3) + C(2) , R(1) -> R(1) + R(2) ,
R(1) -> R(1) + R(2) - R(3).....but i could get nothing...its not my homework sum....i am just a 6th grade maths enthusiast.....i saw this sum somewhere.....i tried to solve this but couldnt get.......can anyone help me up to solve this......or atleast guide me.......where C(1) means column 1 and R(1) means Row 1 and similar things to that
• Jun 10th 2012, 12:03 PM
BobP
Re: A sum in determinants...need help....
Can you check for typo's ? As a way of checking the result I substituted values for a,b and c.
a=1,b=1,c=0 yields different results (-2 and zero) for the determinant and the RHS.