Math Problem Statement
Solution
The given problem requires finding the limit:
Solution:
Step 1: Recognize the indeterminate form
As , the numerator becomes and the denominator is also . Therefore, this is an indeterminate form of the type , and we need to resolve it.
Step 2: Use the expansion of a cube root
The cube root function can be expanded as: [ \sqrt[3]{27 + h} = \sqrt[3]{27} + \frac{1}{3 \cdot \sqrt[3]{27^2}} h + \mathcal{O}(h^2), ] where .
Step 3: Substitute the expansion into the limit
Substitute into the numerator:
Simplify:
Step 4: Simplify further
Divide through by :
Step 5: Take the limit as
As , the higher-order term vanishes. Thus:
Final Answer:
Let me know if you want further clarification or details about this problem! Here are five questions to deepen understanding:
- What other methods could you use to evaluate this limit (e.g., L'Hopital's Rule)?
- How does the expansion for help in simplifying the limit?
- Can you generalize this technique for other roots, such as square roots?
- What would happen if were not approaching ?
- Why is the higher-order term negligible in this limit?
Tip: For indeterminate forms like , using expansions or derivatives often simplifies the evaluation.
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Math Problem Analysis
Mathematical Concepts
Limits
Indeterminate Forms
Expansion of Cube Roots
Formulas
Expansion of cube root: cube_root(a + b) = cube_root(a) + (b / [3 * a^(2/3)]) + higher-order terms
Simplification of indeterminate forms using series expansions
Theorems
Limit definition for indeterminate forms
Expansion for cube roots
Suitable Grade Level
Grade 11-12 or Early College