নিম্নলিখিত কোন দ্বিঘাত সমীকরণের একটি বীজ 2 + \(\sqrt5\) ?

1
x2 + 4x + 1 = 0
2
x2​ - 4x - 1 = 0
3
x2​ - 5x - 1 = 0
4
x2​ + 5x + 1 = 0

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