Advanced Math practice question

Answer: A. k = 2

x² + 3 is always at least 3, so y = k meets the parabola only when k ≥ 3. k = 2 gives no solution.

Why the other answers are wrong

B. k = 3

k = 3 touches the vertex: one solution.

C. k = 4

k = 4 gives x² = 1: two solutions.

D. k = 7

k = 7 gives x² = 4: two solutions.

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