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Problem 18 - Entrance Test

Solve the equation x^2 + 4x + 4 = 0 for x.

Correct: C

The equation is a quadratic equation in the form of (x + a)^2 = 0, where a = 2. Thus, it factors to (x + 2)^2 = 0. Taking the square root of both sides gives us x + 2 = 0. Solving for x, we get x = -2.