5. \( f(x)=\left(5 x^{2}+4 x\right)^{3} \)
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Let's take a trip down memory lane! The function \( f(x) = (5x^2 + 4x)^3 \) is a perfect representation of the power of polynomial expressions. Polynomials date back to ancient civilizations, where mathematicians like Babylonians and Greeks were utilizing them to solve practical problems involving land measurement and trade. They laid the groundwork for the complex polynomial functions we delight in today! But wait, there’s more! If you’re about to tackle the derivative of this function, beware of common pitfalls. Remember to use the chain rule: you'll need to differentiate the outer function (the cubic) and then multiply it by the derivative of the inner polynomial \( 5x^2 + 4x \). A frequent mistake is forgetting to apply this chain rule correctly, leading to incorrect results. Happy deriving!