Which of the following equations has no real roots.

Which of the following equations has no real roots?
(a) x² – 4x + 3√2 = 0
(b) x² + 4x – 3√2 = 0
(c) x² – 4x – 3√2 = 0
(d) 3x² + 4√3x + 4 = 0

Solution:

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