8. Express the following as linear combinations of u= (2, 1, 4), v= (1,–1, 3), and w (3, 2, 5). (a) (–9, –7, –15) (b) (6, 11, 6) (c) (0, 0, 0)

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A: S=1, 0, 2, 1, 1, 1, -1, 1, 5 Now, 1 1-10 1  12 1  5=15-1-10-2-10-2=4+2+2=8≠0

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