Problem 20 - Entrance Test

Solve for x in the equation x^2 + 4x + 4 = 16.

A. x = -6B. x = -2C. x = 2D. x = -4

Correct: A

Rearrange the equation to set it to 0: x^2 + 4x + 4 - 16 = 0, which simplifies to x^2 + 4x - 12 = 0. Factor the quadratic equation: (x + 6)(x - 2) = 0. So, x = -6 or x = 2.