खालीलपैकी कोणत्या समीकरणाचे वास्तव मूळ नाही?

1
2x2 + 16x + 3 = 0
2
2x2 + 10x - 1 = 0
3
x2 - 8x + 1 = 0
4
4x2 + 9x + 6 = 0

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