Math Problem Statement

Lim

lim (h -> 0) [ (8 + h)^(1/3) / h ]

Solution

The expression in the image is:

limh08+h3h\lim_{{h \to 0}} \frac{\sqrt[3]{8+h}}{h}

To solve this limit, let's analyze it:

  1. Direct Substitution: If we directly substitute h=0h = 0, we get: 8+030=20\frac{\sqrt[3]{8 + 0}}{0} = \frac{2}{0} which is undefined (division by zero). Therefore, direct substitution doesn’t work here, so we need a different approach.

  2. Rewrite and Expand: Since this involves a cube root, we can use the approximation for small hh: 8+h32+h12\sqrt[3]{8 + h} \approx 2 + \frac{h}{12} where 83=2\sqrt[3]{8} = 2 and we use the linear approximation for small values of hh around zero.

  3. Substitute the Approximation: Substitute 8+h32+h12\sqrt[3]{8 + h} \approx 2 + \frac{h}{12} into the limit: limh02+h122h=limh0h12h=limh0112=112\lim_{{h \to 0}} \frac{2 + \frac{h}{12} - 2}{h} = \lim_{{h \to 0}} \frac{\frac{h}{12}}{h} = \lim_{{h \to 0}} \frac{1}{12} = \frac{1}{12}

Thus, the answer is: 112\frac{1}{12}

Would you like more details or have any questions on this solution?


Related Questions:

  1. How can we apply different approximations for limits involving cube roots?
  2. What is the general method for handling indeterminate forms like 00\frac{0}{0} in limits?
  3. How does the cube root approximation compare to other methods like L'Hôpital's Rule?
  4. Can we solve this limit using L'Hôpital's Rule, and what would be the process?
  5. Why does direct substitution not work for most indeterminate limits?

Tip:

For limits involving roots, try using Taylor expansions or approximations when direct substitution leads to indeterminate forms.

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Math Problem Analysis

Mathematical Concepts

Limits
Cube Roots
Approximations in Limits

Formulas

lim (h -> 0) [ (f(x + h) - f(x)) / h ]
Cube root approximation: (8 + h)^(1/3) ≈ 2 + h/12 for small h

Theorems

Limit definition of derivatives
Indeterminate forms and approximations

Suitable Grade Level

Grades 11-12