Math Problem Statement
Solution
The problem is to evaluate the limit:
[ \lim_{n \to \infty} \left( \sqrt[3]{n} \cdot \left( \sqrt[3]{n^2} - 3\sqrt[3]{n(n-1)} \right) \right) ]
First, notice that and can be approximated as . As becomes very large, the term inside the cube root becomes insignificant compared to , so . Therefore, we can simplify the expression:
[ \sqrt[3]{n^2} - 3\sqrt[3]{n(n-1)} \approx n^{2/3} - 3n^{2/3} = -2n^{2/3} ]
Now, substituting this back into the original limit:
Thus, the limit diverges to .
Would you like further details on this problem or any related concept? Here are some additional questions you could consider:
- What happens if we do not approximate and calculate exactly?
- How would the limit change if the constant in the expression was a different constant?
- Can this method be used for limits involving other functions with where is not ?
- What are other techniques to evaluate limits involving cube roots?
- How does the behavior of compare to as approaches infinity?
Tip: When evaluating limits of sequences involving roots, consider the leading terms as grows, as they will have the most significant impact on the limit's value.
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Math Problem Analysis
Mathematical Concepts
Limits
Cube Roots
Asymptotic Analysis
Formulas
Cube root formula: \(\sqrt[3]{x} = x^{1/3}\)
Approximation: \(n(n-1)^{1/3} \approx n^{2/3}\)
Theorems
Limit Theorem
Asymptotic behavior of cube roots
Suitable Grade Level
Undergraduate Calculus
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