Let $x$ be a positive real number.  Find the minimum value of $4x^5 + 5x^{-4}.$
Question:
Let $x$ be a positive real number.  Find the minimum value of $4x^5 + 5x^{-4}.$
Answer:
Let's think step by step.

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Let $x$ be a positive real number.  Find the minimum value of $4x^5 + 5x^{-4}.$
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