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Evaluate: |2 3 7 13 17 5 15 20 12|^2 ....

Evaluate: `|2 3 7 13 17 5 15 20 12|^2` .

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`|(2, 3, 7),( 13, 17, 5), (15, 20,12)|^2`
Then
`|A|= 2(17×12 – 5×20) – 3(13×12 – 5×15) + 7(13×20 – 15×17) ` `= 2(204 – 100) – 3(156 – 75) + 7(260 – 255) `
`= 2×104 – 3×81 + 7×5 = 208 – 243 +35 = 0 `
Hence,`|A|^2 = |A|xx|A| |A|^2= 0`
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