Which of the following is not a quadratic equation?

Which of the following is not a quadratic equation?
1). 2x(x + 4) -11 = x(x - 3) + 6
2). 4x(x + 4) -11 = 5x(x - 3) + 5
3). x(x + 2) -15 = x(x - 5) + 11
4). $2x^{2} + 8x - 11 = 0$

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