#### Which of the following is a quadratic equation?

(a) (x – 2) (x + 1) = (x – 1) (x – 3)

(b) (x + 2)^{3} = 2x(x^{2} – 1)

(c) x^{2} + 3x + 1 = (x – 2)^{2}

(d) 8(x – 2)^{3} = (2x – 1)^{3} + 3

**Solution:**

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