Cofactor expansion   3x3  

Last updated: Jan. 2, 2019

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example of cofactor expansion of 3x3 matrix
by cofactors
(a)   along the first column,
(b)   along the second column,
(c)   along the third column,
(d)   along the first row,
(e)   along the second row,
(f)   along the third row.

  Answer

  (a)   Cofactor expansion along the first column:
cofactor expansion along the first column
  (b)  Cofactor expansion along the second column:
cofactor expansion along the second column
  (c)  Cofactor expansion along the third column:
cofactor expansion along the third column
  (d)  Cofactor expansion along the first row:
cofactor expansion along the first row
  (e)  Cofactor expansion along the second row:
cofactor expansion along the second row
  (f)  Cofactor expansion along the third row:
cofactor expansion along the third row