Which of the following equations has no real roots?
For the quadratic equation to have no real roots, the discriminant value should be negative i.e.,
D = b2 - 4ac = 0
A. Given, 
∴ D = b2 - 4ac = 0
Hence, the roots are imaginary.
B. Given, 
∴ D = b2 - 4ac = 0
Hence, the roots are real and distinct.
C. Given, 
∴ D = b2 - 4ac = 0
Hence, the roots are real and distinct.
D. Given, 
∴ D = b2 - 4ac = 0
Hence, the roots are real and equal.
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