Question: Use the Intermediate Value Theorem 1.11 and Rolle's Theorem 1.7 to show that the graph of f (x) = x3 + 2x + k crosses

Use the Intermediate Value Theorem 1.11 and Rolle's Theorem 1.7 to show that the graph of f (x) = x3 + 2x + k crosses the x-axis exactly once, regardless of the value of the constant k.

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