Mathematics

Mathematics

Problem

Find the following limit, showing each algebraic step and stating any limit law you invoke: lim⁡x→∞(ln⁡x)3x.\lim_{x\to \infty}\frac{(\ln x)^3}{x}.
Intuitive explanation

This limit asks whether a polynomial-like function of ln⁡x\ln x can outpace the linear growth of xx itself—a race between logarithmic and algebraic growth. The key insight is that logarithms grow much more slowly than any positive power of xx, so you'll want to rewrite or apply L'Hôpital's Rule repeatedly to expose this dominance. Each application strips away one power of ln⁡x\ln x until you're left with a term that clearly vanishes.

Intuitive explanation

This limit asks whether a polynomial-like function of ln⁡x\ln x can outpace the linear growth of xx itself—a race between logarithmic and algebraic growth. The key insight is that logarithms grow much more slowly than any positive power of xx, so you'll want to rewrite or apply L'Hôpital's Rule repeatedly to expose this dominance. Each application strips away one power of ln⁡x\ln x until you're left with a term that clearly vanishes.

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