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Question
Evaluate the determinant.
`|(3,-4,5),(1,1,-2),(2,3,1)|`
Evaluate
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Solution
`|(3,-4,5),(1,1,-2),(2,3,1)|`
= `3|(1,-2),(3,1)| + 4|(1,-2),(2,1)| + 5|(1,1),(2,3)|`
= 3[1 × 1 − (−2) × 3] + 4[1 × 1 − (−2) × 2] + 5[1 × 3 − 2 × 1]
= 3[1 + 6] + 4[1 + 4] + 5[3 − 2]
= 3 × 7 + 4 × 5 + 5 × 1
= 21 + 20 + 5
= 46
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