Which of the following are quadratic equations?

x^{2} + 1/x^{2} = 5

x – 3/x = x^{2}

√3x^{2} – 2x + 1/2 = 0

2x^{2} – √(3x) + 9 = 0

x^{2} – 2x – √x – 5 = 0

3x^{2} – 5x + 9 = x^{2} – 7x + 3

x + 1/x = 1

x^{2} – 3x = 0

(x + 1/x)^{2} = 3(x + 1/x) + 4

(2x + 1)(3x + 2) = 6(x – 1)(x – 2)

x + 1/x = x^{2}, x ≠ 0

16x^{2} – 3 = (2x + 5)(5x – 3)

(x + 2)^{3} = x^{3} – 4

x(x + 1) + 8 = (x + 2)(x – 2)

In each of the following, determine whether the given values are solutions of the given equation or not:

x^{2 }– 3x + 2 = 0 , x = 2 , x = – 1

x^{2} + 6x – 4 = 0

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