Math Problem Statement

Nerd Al - Tutor & Math Helper

Obtain the partial fraction decomposition for f(x) = (x^6 - 2x^3 + 3) / (x^2 - 1) and g(x) = (3x + 13) / ((x - 3)(x - 5)).

Solution

Let's solve the partial fraction decomposition for both f(x)f(x) and g(x)g(x) as requested in the image.

1. For f(x)=x62x3+3x21f(x) = \frac{x^6 - 2x^3 + 3}{x^2 - 1}:

The denominator x21x^2 - 1 can be factored as: x21=(x1)(x+1)x^2 - 1 = (x - 1)(x + 1)

Thus, we rewrite the function f(x)f(x) as: f(x)=x62x3+3(x1)(x+1)f(x) = \frac{x^6 - 2x^3 + 3}{(x - 1)(x + 1)}

The goal is to express f(x)f(x) in the form: x62x3+3(x1)(x+1)=Ax1+Bx+1\frac{x^6 - 2x^3 + 3}{(x - 1)(x + 1)} = \frac{A}{x - 1} + \frac{B}{x + 1}

We need to solve for the constants AA and BB by equating the numerator of the original expression with the one we get after combining the fractions: x62x3+3=A(x+1)+B(x1)x^6 - 2x^3 + 3 = A(x + 1) + B(x - 1)

We can solve this by expanding both sides and comparing coefficients.

2. For g(x)=3x+13(x3)(x5)g(x) = \frac{3x + 13}{(x - 3)(x - 5)}:

We aim to decompose the expression into partial fractions: 3x+13(x3)(x5)=Ax3+Bx5\frac{3x + 13}{(x - 3)(x - 5)} = \frac{A}{x - 3} + \frac{B}{x - 5}

To find AA and BB, we multiply both sides by (x3)(x5)(x - 3)(x - 5), giving: 3x+13=A(x5)+B(x3)3x + 13 = A(x - 5) + B(x - 3)

Expand and solve for AA and BB by comparing coefficients of xx and the constant term.

Would you like a step-by-step detailed solution for both problems? Let me know if you have any specific questions!

Here are 5 related questions for further practice:

  1. How do you handle irreducible quadratic factors in partial fraction decomposition?
  2. What happens if the degree of the numerator is equal to or greater than the denominator in partial fractions?
  3. Can partial fractions be applied to improper fractions, and how?
  4. How would you find partial fractions for higher-degree polynomials?
  5. How can you use partial fractions in solving integrals?

Tip: Always factor the denominator as much as possible before starting partial fraction decomposition!

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Math Problem Analysis

Mathematical Concepts

Partial Fraction Decomposition
Factoring Polynomials
Algebra

Formulas

f(x) = A / (x - 1) + B / (x + 1)
g(x) = A / (x - 3) + B / (x - 5)

Theorems

Partial Fraction Decomposition Theorem
Factoring Theorem

Suitable Grade Level

Grades 10-12