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Which of the following is not a quadratic equation? (a) 3x - x^2 = x^2 + 5

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Which of the following is not a quadratic equation?

(a) 3x - x2 = x2 + 5

(b) (x + 2)2 = 2(x2 - 5)

(c) (√2x + 3)2 = 2x2 + 6

(d) (x - 1)2 = 3x2 + x - 2

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Correct answer is (c) (√2x + 3)2 = 2x2 + 6

which is not a quadratic equation

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