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14-01-2018
Mathematics

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Find a + b, 2a + 3b, |a|, and |a − b|. a = i + 4j − 2k, b = −4i − j + 6k

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16-01-2018

a + b = i + 4j - 2k + (-4i - j + 6k)

= i + 4j - 2k - 4i - j + 6k

= -3i + 3j + 4k

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