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Question
If A = `[(1,1,-2),(2,1,-3),(5,4,-9)]`, Find |A|
Solution
`|A| = |(1,1,2),(2,1,3),(5,4,9)|`
= `1|(1,-3), (4,-9)| -1 |(2,-3),(5,-9)|, -2|(2,1),(5,4)|`
= 1(- 9 + 12) - 1(- 18 + 15) - 2(8 - 5)
= 3 + 3 - 6
= 0
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