1.

If A^(-1)=[[3,-1,1],[-15,6,-5],[5,-2,2]] and B=[[1,2,-2],[-1,3,0],[0,-2,1]]find(AB)^-1

Answer»

SOLUTION :Initiatly find `B^(-1):B^(-1)=(adjB)/(|B|)=[[3,2,6],[1,1,2],[2,2,5]]`
Then `(AB)^(-1)=B^(-1)A^(-1)=[[9,-3,5],[-2,1,0],[1,0,2]]`


Discussion

No Comment Found

Related InterviewSolutions