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• Lei i be a real number for which the s...

• Lei i be a real number for which the system of linear equations x+y+z=6, 4x + ay - az = -2, 3x + 2y - 42 =-5 has infinitely many solutions. Then 2 is a root of the quadratic equation (1) 2² -32-4=0 (2) 2²+ 32-4=0 (3) 2²-2-6=0 ::.. (4) 2² + 2-6=0

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