Which of the following is not a quadratic equation?

Which of the following is not a quadratic equation?
1). 3x(x + 5) - 11 = 2x(x ­- 2) + 6
2). 4x(x + 3) + 7 = 4x(x ­- 11) + 9
3). x(x + 2) -­15 = x(2x -­ 5) + 11
4). $4x^{2}$ -­ 6x -­ 9 = 0

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