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Question
Evaluate the following determinants: `|(5, 5, 5),(5, 4, 4),(5, 4, 8)|`
Solution
`|(5, 5, 5),(5, 4, 4),(5, 4, 8)|`
= `5|(4, 4),(4, 8)| - 5|(5, 4),(5, 8)| + 5|(5, 4),(5, 4)|`
= 5(32 – 16) –5(40 – 20) + 5(20 –20)
= 5(16) – 5(20) + 5(0)
= 80 –100
= – 20.
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