Question

A vector perpendicular to (3ȋ + 9ĵ) is

Answer 1

Answer: Calculate the cross product of X and U, using U = (10, 4, -1): W = X×U = (0, 1, 4). Check that W is perpendicular to U. W∙U = 0 + 4 - 4 = 0. Using Y = (0, 1, 0) or Z = (0, 0, 1) would give different perpendicular vectors

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