Finding the Determinants for Matrix

Watch
OJ Emporium
Badges: 13
Rep:
?
#1
Report Thread starter 3 months ago
#1
The question: https://gyazo.com/005997e8069185fb56235fe15ef10e0e

I did manage to successfully find the answers for AB, |A| and |B| and |AB| but I'm having some difficulty in properly re-arranging the answer for |AB| to equal |A||B|.
For |A||B| I got (ad-bc)(eh-fg) and for |AB| it was (ae+bg)(cf+ch) - (af+bh)(ce+dg)

Not exactly sure how I'm supposed to completely simplify it to get |A||B|
0
reply
Pangol
Badges: 14
Rep:
?
#2
Report 3 months ago
#2
(Original post by OJ Emporium)
The question: https://gyazo.com/005997e8069185fb56235fe15ef10e0e

I did manage to successfully find the answers for AB, |A| and |B| and |AB| but I'm having some difficulty in properly re-arranging the answer for |AB| to equal |A||B|.
For |A||B| I got (ad-bc)(eh-fg) and for |AB| it was (ae+bg)(cf+ch) - (af+bh)(ce+dg)

Not exactly sure how I'm supposed to completely simplify it to get |A||B|
The only thing you can realistically do is to expand and simplify both versions and show that they are the same. However, you have a small error in you expression for |AB|. Check the term (cf+ch) - it should be slightly different.
1
reply
OJ Emporium
Badges: 13
Rep:
?
#3
Report Thread starter 3 months ago
#3
(Original post by Pangol)
The only thing you can realistically do is to expand and simplify both versions and show that they are the same. However, you have a small error in you expression for |AB|. Check the term (cf+ch) - it should be slightly different.
Most certainly did not see that error, thank you for the heads up
0
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts
Back
to top
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

What are you most likely to do if you don't get the grades you were expecting?

Go through Clearing (74)
40.22%
Take autumn exams (61)
33.15%
Look for a job (5)
2.72%
Consider an apprenticeship (6)
3.26%
Take a year out (26)
14.13%
Something else (let us know in the thread!) (12)
6.52%

Watched Threads

View All