For the quadratic equation 2x² + 4x + k = 0 to have real roots, what must be the condition on k?
Answer: B. k ? 4
The condition for real roots is that the discriminant must be non-negative. Here, the discriminant is 4² - 4(2)(k) = 16 - 8k. For real roots, 16 - 8k ? 0, which simplifies to k ? 2.