Which of the following quadratic equations has roots that are equal?

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A. x² - 4x + 4 = 0

B. x² + 3x + 2 = 0

C. x² - 5x + 6 = 0

D. x² + 2x + 1 = 0

E. None of the above

Answer: A. x² - 4x + 4 = 0

A quadratic equation has equal roots when the discriminant is zero. For x² - 4x + 4, the discriminant is 0.

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