Matrices

[Sir.Aaron]

Iv just started (today is my first day)to learn about matrices. Now in my book it give's some practice problems and one I cant seem to get right. Can anyone here help me?
Here is the problem..
http://i21.photobucket.com/albums/b276/Toxic590/untitled-2.jpg
Now the answer SHOULD be(according to the book)
http://i21.photobucket.com/albums/b276/Toxic590/untitled1.jpg
But this is what I keep getting
http://i21.photobucket.com/albums/b276/Toxic590/untitled2.jpg

You see, Im right... up untill I have to subtract that -3...Any thoughts?

[cristo]

Well.. you may need to show some working. For example, the bottom left element has values i=3, j=1. So plug these into your equation-- what do you get?

[Sir.Aaron]

Well.. you may need to show some working. For example, the bottom left element has values i=3, j=1. So plug these into your equation-- what do you get?
Yeah thats what I thought I was supposed to do..but when I do that I get:

a31= 3^2+2(1)-3=5

See what Im say'n?

[Moo Of Doom]

9+2-3=5?

How do you get that?

[Sir.Aaron]

9+2-3=5?

How do you get that?
:approve: haha woops...I see what I did..thanks man:biggrin: