Which of the following equations represents a quadratic equation?

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A. 3x + 2 = 0

B. x² - 4x + 4 = 0

C. 5x³ + 2x = 0

D. x + 1 = 0

E. None of the above

Answer: B. x² - 4x + 4 = 0

A quadratic equation is defined as an equation of the form ax² + bx + c = 0, where a ? 0. The equation x² - 4x + 4 = 0 fits this definition.

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