Math Problem Statement

∫(x + 2) / [x√(x - 3)] dx

Solution

The integral in the image is:

x+2xx3dx\int \frac{x+2}{x \sqrt{x - 3}} \, dx

Step-by-step solution:

  1. Substitute: A good substitution would be u=x3u = x - 3, which simplifies the square root and the expression inside. Let's proceed with this:

    u=x3du=dxu = x - 3 \quad \Rightarrow \quad du = dx

    Also, x=u+3x = u + 3.

  2. Rewrite the integral: Substitute these into the original integral:

    (u+3)+2(u+3)udu\int \frac{(u + 3) + 2}{(u + 3) \sqrt{u}} \, du

    Simplifying the numerator:

    =u+5(u+3)udu= \int \frac{u + 5}{(u + 3) \sqrt{u}} \, du

  3. Separate terms: Split the integral into two parts:

    u(u+3)udu+5(u+3)udu\int \frac{u}{(u + 3) \sqrt{u}} \, du + \int \frac{5}{(u + 3) \sqrt{u}} \, du

    Simplify each term further and solve accordingly, using standard integration techniques, like partial fractions and substitution for the second term.


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Tip: Substitutions in integrals are a powerful tool when dealing with square roots or complex expressions. Choosing the right substitution simplifies the problem greatly.

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Math Problem Analysis

Mathematical Concepts

Integration
Substitution
Partial Fractions

Formulas

Substitution: u = x - 3
Partial Fractions

Theorems

Fundamental Theorem of Calculus

Suitable Grade Level

Undergraduate Calculus