20. Prove u = [- 2,5, 1], v = [2,1, - 1] and w = [-6,0, - 12] are orthogonal. (4 marks) 21. Determine the
20. Prove u = [- 2,5, 1], v = [2,1, - 1] and w = [-6,0, - 12] are orthogonal. (4 marks) 21. Determine the value of k so that u = [- 5, k, 3] and v = [1,2, - 7] are orthogonal. (2 marks)
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