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Question
If `veca = 3hati - hatj + 2hatk, hatb = 2hati + hatj - hatk`, then find `|veca xx vecb|`.
Sum
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Solution
`veca xx vecb = |(hati, hatj, hatk),(3, -1, 2),(2, 1, -1)|`
= `(1 - 2)hati - (-3 - 4)hatj + (3 + 2)hatk`
= `-hati + 7hatj + 5hatk`
∴ `|veca xx vecb| = sqrt((-1)^2 + 7^2 + 5^2)`
= `sqrt(1 + 49 + 25)`
= `sqrt(75)`
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