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Chapter 11: Problem 1

How is polynomial long division like long division with whole numbers? How is it different?

Short Answer

Expert verified
Polynomial long division and long division of whole numbers both operate on the principle of repeated subtraction. The process for both involves dividing, multiplying, and subtracting until the remainder is less than the divisor. The main difference is in what we are dividing. In whole number division, we divide simple numbers whereas in polynomial long division, we divide terms of polynomials, focusing on the highest degree terms.

Step by step solution

01

Understand Long Division with Whole Numbers

Standard long division with whole numbers involves repeatedly subtracting the divisor from the dividend, each time recording the result until the remaining dividend is less than the divisor. In each step we multiply the divisor by an integer, subtract it from the dividend and write down the result. We then bring down a digit from the original dividend and repeat the process.
02

Understand Polynomial Long Division

In polynomial long division, the process is quite similar. The main difference lies in what we are dividing. Instead of whole numbers, we are using polynomials. The process involves dividing the highest degree term of the dividend by the highest degree term of the divisor and writing the result on the quotient line. We then multiply the entire divisor by this quotient, subtract it from the dividend and write down the result. This new polynomial becomes the dividend for the next step, and the process is repeated until the degree of the divisor is greater than the degree of the dividend.
03

Compare and Contrast

Both the divisions works in the same fundamental principle: division as repeated subtraction. The main difference lies in the nature of the numbers being divided (whole numbers vs polynomials). Moreover, when dividing polynomials, attention must be paid to the degree of the terms. The divisor must always divide the term with the highest degree in the dividend.

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Key Concepts

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

Long Division with Whole Numbers
Long division with whole numbers is a method used to divide larger numbers by smaller numbers. In this process, the objective is to determine how many times the divisor fits into the dividend. The process starts by looking at how many times the divisor fits into the initial part of the dividend.
  • You write the quotient above the dividend.
  • Multiply the divisor by this quotient and subtract from the dividend to find the remainder.
  • "Bring down" the next digit of the dividend to the remainder and repeat.
This cycle continues until all digits have been brought down. The result is a quotient above the dividend and, if there is any remaining, a remainder at the end of the process. This is a systematic and organized method for handling division problems, and forms the basis for understanding more complex division techniques, such as polynomial division.
Polynomial Division
Polynomial division is an algebraic technique used to divide one polynomial by another. At its core, polynomial division functions similarly to long division with whole numbers but instead involves dividing expressions with variables and coefficients.
  • Start with identifying the highest degree terms of the dividend and divisor.
  • Divide the leading term of the dividend by the leading term of the divisor to get the first term of the quotient.
  • Multiply the entire divisor by this term and subtract it from the dividend to find the new dividend.
  • Repeat the process with the new polynomial dividend.
The procedure continues until the degree of the remaining polynomial (new dividend) is less than the degree of the original divisor. Polynomial division is crucial in simplifying expressions, solving equations, and integrating functions in calculus. It builds on the systematic approach of whole number long division, extending it to algebraic expressions.
Degree of Polynomials
The degree of a polynomial is a fundamental concept when performing polynomial operations like division. It informs us about the highest power of the variable present in the polynomial expression.
  • This helps determine the leading term, which guides the division process.
  • The degree of a polynomial is important for manipulating expressions effectively during division.
  • In the division process, the leading term's degree is key since you must always divide the highest degree term in the dividend by the highest degree term in the divisor.
Understanding the degree helps ensure the correctness of division steps and guarantees that the process concludes when the degree of the remaining dividend is less than that of the divisor. This allows students to predict the number of terms in the quotient.
Arithmetic Operations
Arithmetic operations such as addition, subtraction, multiplication, and division form the bedrock of mathematical calculations. In both long division with whole numbers and polynomial division, these operations are the essential tools used throughout the process.
  • Subtraction is used consistently in both types of divisions to find remainders.
  • Multiplication plays a crucial role in determining what is to be subtracted next.
  • Addition may be used to combine results in intermediary steps.
  • Moreover, division itself is the central operation as it breaks down the problem into manageable steps.
Mastering these operations is essential because they ensure accuracy and efficiency in finding solutions. Whether you鈥檙e working with whole numbers or polynomials, arithmetic operations are at the heart of reaching the correct result.

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Write the equation in standard form. (Lesson 9.5 for 11.7 ) $$-4+3 y^{2}=y$$

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