Question: The function f(x) = 2x ^4 + 3x ^3 + 4x ^2 + 5x + 6 has one critical number. Find an interval containing it

The function f(x) = 2x ^4 + 3x ^3 + 4x ^2 + 5x + 6 has one critical number. Find an interval containing it and justify your answer.

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