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Write out the form of the partial fraction decomposition. (Do not find the numerical values of the coefficients.) \(\frac{2 x-3}{x^{3}-x^{2}}\)

Short Answer

Expert verified
The partial fraction decomposition is \(\frac{A}{x} + \frac{B}{x^2} + \frac{C}{x - 1}\).

Step by step solution

01

Identify the Denominator

The denominator of the expression is \(x^3 - x^2\). We can factor this by taking out the greatest common factor which is \(x^2\). Thus, the factored form is \(x^2(x - 1)\).
02

Set Up the Partial Fraction Decomposition Format

Since the factored denominator is \(x^2(x - 1)\), the partial fraction decomposition will have terms corresponding to each factor. For \(x^2\), we use \(\frac{A}{x} + \frac{B}{x^2}\) and for the linear term \((x - 1)\), we use \(\frac{C}{x - 1}\). Thus, the partial fraction decomposition is \(\frac{A}{x} + \frac{B}{x^2} + \frac{C}{x - 1}\).
03

Combine Terms Over a Common Denominator

In this case, we simply set up the sum of fractions: \(\frac{2x - 3}{x^3 - x^2} = \frac{A}{x} + \frac{B}{x^2} + \frac{C}{x - 1}\). Ensure that all parts use the common denominator \(x^2(x - 1)\). This setup is used to eventually solve for the coefficients if needed.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Understanding Algebraic Fractions
Algebraic fractions are a form of expression used extensively in mathematics, particularly when dealing with equations involving variables. These are similar to typical fractions, except that at least one part—a numerator or a denominator—contains a polynomial rather than just simple numbers. In our exercise, we are dealing with the algebraic fraction \(\frac{2x-3}{x^3-x^2}\). Here, both the numerator and the denominator are polynomials: the numerator being \(2x-3\) and the denominator \(x^3-x^2\).

Algebraic fractions often need to be rewritten in different forms, depending on the application or the problem's requirements. One such method is partial fraction decomposition, which expresses a complex fraction as a sum of simpler fractions. This approach is very handy when integrating functions or solving linear differential equations. Understanding the component polynomials by factoring them first is essential in simplifying these types of fractions.

By simplifying the fraction, we can more easily combine terms, perform operations, or further solve complex equations where these fractions are involved.
Factoring Polynomials
Factoring is a crucial step when dealing with algebraic expressions, particularly when we perform partial fraction decomposition. The goal of factoring is to break down polynomials into simpler "factor" expressions that, when multiplied together, return the original polynomial. The process can significantly simplify the arithmetic and algebraic operations later on.

In our given problem, the denominator \(x^3-x^2\) is a polynomial that needs factoring. To do this, we look for the greatest common factor (GCF) in all the terms. Here, \(x^2\) is the common factor. Extracting \(x^2\) from the expression, we rewrite it as \(x^2(x-1)\). This transformation is meaningful because it allows us to identify distinct polynomial parts that can lead to partial fractions.

For students or anyone working through similar problems:
  • Always search for the greatest common factor first.
  • Recognize different types of polynomial structures (e.g., difference of squares, quadratics).
  • Check your factors to ensure their product equals the original polynomial.
Such practices ensure an accurate and efficient way to handle complex algebraic problems.
Basics of Polynomial Division
Sometimes with algebraic expressions, it's necessary to perform polynomial division. Although this isn't required directly in the given exercise, understanding polynomial division can aid immensely in understanding why certain methods, like partial fraction decomposition, are employed.

Polynomial division is similar to long division with numbers. It involves dividing a polynomial by another polynomial to obtain a quotient and a remainder. This method is particularly useful when the degree of the numerator is higher than that of the denominator, such as when the expression cannot be simplified by simple factoring alone.

While our current problem only involves simplifying the expression through factoring, it's good to familiarize oneself with polynomial division:
  • Align terms from highest to lowest degree.
  • Divide the leading term of the numerator by the leading term of the divisor.
  • Multiply the entire divisor by the resulting term.
  • Subtract the product from the original polynomial and repeat.
Mastering polynomial division ensures that any preliminary algebraic manipulations are easily handled, enabling a smooth transition into applying partial fraction decomposition or other algebraic techniques.

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