x+ y- z= 0 2x + 4y - z= 0 3x + 2y + 2z = 0 (b) X + 2x, – 3x, + 4x, =0 2x, – 3x + 5x3 - 7x4 = 0 5x, + 6x2 – 9x3 + 8x, 0 (c)

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