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Question
Find the sum of the vectors `veca = hati -2hatj + hatk, vecb = -2hati + 4hatj + 5hatk and vecc = hati - 6hatj - 7hatk.`
Solution
`veca = hati -2hatj + hatk, vecb = -2hati + 4hatj + 5hatk` and `vecc = hati - 6hatj - 7hatk`
sum total
`veca + vecb + vecc` = `(1 - 2 + 1)hati + (-2 + 4 - 6)hatj + (1 + 5 - 7)hatk`
= `0.hati - 4.hatj - 1.hatk`
= `-4hatj - hatk`
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