3 votes 3 votes If $A$ is a $4$ rowed square matrix such that $\mid A \mid = 4$, then $\text{adj (adj } A)$ is equal to _____. $2A$ $4A$ $8A$ $16A$ Mathematical Logic tbb-mathematics-2 + – Bikram asked May 24, 2017 edited Aug 14, 2019 by Counsellor Bikram 345 views answer comment Share Follow See all 0 reply Please log in or register to add a comment.
Best answer 4 votes 4 votes Adj(Adj(A)) =|A|^(n-2).A [ n = dimension size , in this case is 4] = |A|^(4-2).A = |A|^2 . A = 16A Harsh181996 answered Jun 2, 2017 selected Jun 10, 2017 by Bikram Harsh181996 comment Share Follow See all 3 Comments See all 3 3 Comments reply rahul sharma 5 commented Jul 28, 2017 reply Follow Share @Harsh. How can i derive this formula using following identity:- adj(A)⋅A=detA⋅In 0 votes 0 votes rahul sharma 5 commented Jul 29, 2017 reply Follow Share @Bikram sir,can you help in above doubt? 0 votes 0 votes Bikram commented Jul 29, 2017 reply Follow Share @ rahul sharma 5 read this https://math.stackexchange.com/questions/92837/proof-mathrmadj-mathrmadja-mathrmdetan-2-cdot-a-for-a video , see this https://www.youtube.com/watch?v=Vej0dRB1MGw 3 votes 3 votes Please log in or register to add a comment.