For the quadratic equation 2x² + 4x + k = 0 to have real roots, what must be the condition on k?
Answer: A. k ? 8
The condition for real roots is the discriminant b² - 4ac ? 0. Here, 4² - 4(2)(k) ? 0 leads to 16 - 8k ? 0, or k ? 2. Thus, k must be less than or equal to 2.