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Question
Evaluate: `|(2, -5, 7),(5, 2, 1),(9, 0, 2)|`
Solution
`|(2, -5, 7),(5, 2, 1),(9, 0, 2)|`
= `2|(2, 1),(0, 2)| - (-5) |(5, 1),(9, 2)| + 7|(5, 2),(9, 0)|`
= = 2(4 – 0) + 5(10 – 9) + 7(0 – 18)
= 2(4) + 5(1) + 7(– 18)
= 8 + 5 – 126
= – 113
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