Math Problem Statement

Integrate x^2 / (4th root of (x^3 + 2)) dx

Solution

The integral you're asking to evaluate is:

x2x3+24dx\int \frac{x^2}{\sqrt[4]{x^3 + 2}} \, dx

To solve this, let's apply a substitution method.

Step-by-Step Solution:

  1. Substitution: Let u=x3+2u = x^3 + 2. Then: du=3x2dxdu3=x2dxdu = 3x^2 \, dx \quad \Rightarrow \quad \frac{du}{3} = x^2 \, dx

  2. Rewrite the integral: Using this substitution, the integral becomes: [ \int \frac{x^2}{\sqrt[4]{x^3 + 2}} , dx = \int \frac{1}{\sqrt[4]{u}} \cdot \frac{du}{3} ] which simplifies to: 13u14du\frac{1}{3} \int u^{-\frac{1}{4}} \, du

  3. Solve the integral: The integral of u14u^{-\frac{1}{4}} is: 13(u3434)=49u34\frac{1}{3} \cdot \left( \frac{u^{\frac{3}{4}}}{\frac{3}{4}} \right) = \frac{4}{9} u^{\frac{3}{4}}

  4. Substitute back u=x3+2u = x^3 + 2: 49(x3+2)34+C\frac{4}{9} (x^3 + 2)^{\frac{3}{4}} + C

Final Answer:

x2x3+24dx=49(x3+2)34+C\int \frac{x^2}{\sqrt[4]{x^3 + 2}} \, dx = \frac{4}{9} (x^3 + 2)^{\frac{3}{4}} + C

Would you like further clarification on any steps or additional details?

Here are 5 related questions:

  1. How can substitution be chosen effectively for complex integrals?
  2. What are other methods for solving integrals besides substitution?
  3. How would you approach an integral if the substitution method didn’t work?
  4. Can you explain the rules for integrating powers of uu?
  5. What happens if the function inside the integral is more complicated, like trigonometric functions?

Tip: Always check the derivative after substitution to ensure it matches the original function!

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Math Problem Analysis

Mathematical Concepts

Integration
Substitution Method
Power Rule in Integration

Formulas

Integral of u^n with respect to u: (u^(n+1))/(n+1) + C
Substitution: u = f(x)

Theorems

Fundamental Theorem of Calculus

Suitable Grade Level

Undergraduate Level (Calculus I/II)