Math Problem Statement

Evaluate the integral: (x-4)/[(x-1)^2 * (x^2 + 2)] dx.

Solution

The integral provided in the image is:

(x4)(x1)2(x2+2)dx\int \frac{(x-4)}{(x-1)^2(x^2+2)} \, dx

To evaluate this integral, we can approach it using partial fraction decomposition, as the integrand involves a product of polynomials with distinct factors. Here are the steps to solve:

Step 1: Setup partial fraction decomposition

The expression we are trying to decompose is:

(x4)(x1)2(x2+2)\frac{(x-4)}{(x-1)^2(x^2+2)}

We assume the following form for the partial fraction decomposition:

Ax1+B(x1)2+Cx+Dx2+2\frac{A}{x-1} + \frac{B}{(x-1)^2} + \frac{Cx+D}{x^2+2}

Multiplying both sides of this equation by (x1)2(x2+2)(x-1)^2(x^2+2) gives:

x4=A(x1)(x2+2)+B(x2+2)+(Cx+D)(x1)2x - 4 = A(x-1)(x^2+2) + B(x^2+2) + (Cx+D)(x-1)^2

Step 2: Expand the right-hand side and collect terms

We need to expand and collect like powers of xx to solve for AA, BB, CC, and DD.

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Math Problem Analysis

Mathematical Concepts

Integral Calculus
Partial Fractions
Polynomial Division

Formulas

Partial Fraction Decomposition
Standard Integrals of Rational Functions

Theorems

Fundamental Theorem of Calculus
Linear Decomposition of Rational Functions

Suitable Grade Level

Undergraduate (Calculus Level)