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Could anyone explain to me how to do this question Use the discriminant (X^2) + 2 - y(x - 1) to show that the range of ((X^2) + 2)/(x - 1) is equal to (- ∞, 2 - 2*((3)^(1/2)))) U (2 + 2*((3)^(1/2)))), ∞) note 2 - 2*((3)^(1/2)))) = 2 - the square root of 3 U = union