Solution.
A=⎝⎛122203314⎠⎞ The elements of the minor of the matrix A will be given by
M1,1=∣∣0314∣∣=−3
M1,2=∣∣2214∣∣=6
M1,3=∣∣2203∣∣=6
M2,1=∣∣2334∣∣=−1
M2,2=∣∣1234∣∣=−2
M2,3=∣∣1223∣∣=−1
M3,1=∣∣2031∣∣=2
M3,2=∣∣1231∣∣=−5
M3,3=∣∣1220∣∣=−4
Hence, M=⎝⎛−3−126−2−56−1−4⎠⎞
The cofactor matrix will be given by Ci,j=(−1)i+jMi,j.
C=⎝⎛−312−6−2561−4⎠⎞
Comments