Engineering Board Exam Reviewer · Matrix Inverse and Cofactors · medium

For the matrix A= bmatrix3&2\1&4 bmatrix, find the cofactor matrix.

  1. bmatrix4&-1\-2&3 bmatrix
  2. bmatrix4&1\2&3 bmatrix
  3. bmatrix3&2\1&4 bmatrix
  4. bmatrix4&-2\-1&3 bmatrix

Answer

A. bmatrix4&-1\-2&3 bmatrix

Solution

C11=+4, C12=-1, C21=-2, C22=+3. Cofactor matrix = bmatrix4&-1\-2&3 bmatrix.

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