SOLUTION: evaluate the determinant (3by3) [1-1 2] -1 2 0 -1 3 1

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Question 1077536: evaluate the determinant (3by3)
[1-1 2]
-1 2 0
-1 3 1
Answer by Alan3354(69443) About Me  (Show Source):
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evaluate the determinant (3by3) 
 
 1 -1  2
-1  2  0
-1  3  1

Det = 1*(2*1 - 3*0) + 1*(-1 - 0) + 2*(-3 + 2)
= 2 - 1 - 2
= -1