Which of the following equations has roots that are both real and equal?

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A. x^2 - 4x + 4 = 0

B. x^2 - 3x + 2 = 0

C. x^2 + 2x + 5 = 0

D. x^2 - x + 1 = 0

E. None of the above

Answer: A. x^2 - 4x + 4 = 0

A quadratic equation has real and equal roots if the discriminant (b^2 - 4ac) is zero. For x^2 - 4x + 4, the discriminant is 0.

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