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For the quadratic equation 2x^2 + 4x + k = 0 to have real roots, what must be the condition on k?

Answer: C. k ? -4
The condition for real roots is that the discriminant must be non-negative: b^2 - 4ac ? 0. Here, 4^2 - 4(2)(k) ? 0 leads to k ? -4.
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