Question 607697: Evaluate the determinant: Please show me the steps.
{{8,1,3},{2,-1,4},{1,-1,2}}
Answer by richard1234(7193)   (Show Source):
You can put this solution on YOUR website! Look up the following website: http://en.wikipedia.org/wiki/Determinant
Basically the determinant is 8*det(A) - 1*det(B) + 3*det(C)
where A,B,C are the matrices determined by truncating every entry in the same column or row as 8, 1, 3. In other words,
A = {{-1,4}{-1,2}}
B = {{2,-4}{1,2}}
C = {{2,-1}{1,-1}}
Finding the determinant of a 2x2 matrix should be easy.
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