Engineering Board Exam Reviewer · Matrix Inverse and Cofactors · medium
Find the inverse of A= bmatrix4&7\2&6 bmatrix.
- bmatrix0.6&-0.7\-0.2&0.4 bmatrix
- bmatrix6&-7\-2&4 bmatrix
- bmatrix0.6&0.7\0.2&0.4 bmatrix
- bmatrix0.4&-0.7\-0.2&0.6 bmatrix
Answer
A. bmatrix0.6&-0.7\-0.2&0.4 bmatrix
Solution
(A)=4(6)-7(2)=10. A-1=1/10 bmatrix6&-7\-2&4 bmatrix= bmatrix0.6&-0.7\-0.2&0.4 bmatrix.
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