wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

If A=122212221, then show that A24A5I=0, and hence find A1.

Open in App
Solution

Given, A=122212221
A2=AA=122212221122212221
A2=1+4+42+2+42+4+22+2+41+1+44+2+22+4+24+2+24+4+1
A2=98889888941222122215100010001
=988898889488848884500050005
000000000A24A+5I=0
Pre multiply both sides with A1, we get (A1A)A4A1A+5A1=0
IA4I+5A1=0A1=[4IA]15
A1=15322232223

flag
Suggest Corrections
thumbs-up
1
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Multiplication of Matrices
MATHEMATICS
Watch in App
Join BYJU'S Learning Program
CrossIcon