Which of the following quadratic equations has real roots?

Which of the following quadratic equations has real roots?
1). 4x$^{2}$ - ­9x + 6 = 0
2). 3x$^{2}$ -­ 2x + 6 = 0
3). 2x$^{2}$ - ­7x + 6 = 0
4). x$^{2}$ - ­2x + 2 = 0

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