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April 04, 2023

# Dividing Polynomials - Definition, Synthetic Division, Long Division, and Examples

Polynomials are mathematical expressions that consist of one or several terms, each of which has a variable raised to a power. Dividing polynomials is an essential function in algebra which includes figuring out the remainder and quotient as soon as one polynomial is divided by another. In this article, we will investigate the different methods of dividing polynomials, consisting of long division and synthetic division, and provide examples of how to apply them.

We will also talk about the importance of dividing polynomials and its uses in multiple domains of math.

## Importance of Dividing Polynomials

Dividing polynomials is an important operation in algebra that has multiple utilizations in diverse domains of mathematics, involving calculus, number theory, and abstract algebra. It is utilized to solve a extensive range of challenges, including figuring out the roots of polynomial equations, working out limits of functions, and solving differential equations.

In calculus, dividing polynomials is used to find the derivative of a function, which is the rate of change of the function at any point. The quotient rule of differentiation involves dividing two polynomials, which is applied to figure out the derivative of a function which is the quotient of two polynomials.

In number theory, dividing polynomials is used to learn the properties of prime numbers and to factorize large values into their prime factors. It is also utilized to learn algebraic structures for instance fields and rings, which are fundamental theories in abstract algebra.

In abstract algebra, dividing polynomials is applied to define polynomial rings, which are algebraic structures which generalize the arithmetic of polynomials. Polynomial rings are utilized in many fields of math, including algebraic geometry and algebraic number theory.

## Synthetic Division

Synthetic division is a technique of dividing polynomials which is utilized to divide a polynomial with a linear factor of the form (x - c), where c is a constant. The approach is based on the fact that if f(x) is a polynomial of degree n, therefore the division of f(x) by (x - c) provides a quotient polynomial of degree n-1 and a remainder of f(c).

The synthetic division algorithm includes writing the coefficients of the polynomial in a row, utilizing the constant as the divisor, and working out a series of workings to find the remainder and quotient. The result is a streamlined form of the polynomial that is straightforward to work with.

## Long Division

Long division is a method of dividing polynomials that is used to divide a polynomial by any other polynomial. The approach is founded on the reality that if f(x) is a polynomial of degree n, and g(x) is a polynomial of degree m, where m ≤ n, then the division of f(x) by g(x) offers uf a quotient polynomial of degree n-m and a remainder of degree m-1 or less.

The long division algorithm consists of dividing the greatest degree term of the dividend with the highest degree term of the divisor, and further multiplying the outcome by the entire divisor. The outcome is subtracted from the dividend to get the remainder. The procedure is repeated as far as the degree of the remainder is lower than the degree of the divisor.

## Examples of Dividing Polynomials

Here are some examples of dividing polynomial expressions:

### Example 1: Synthetic Division

Let's say we want to divide the polynomial f(x) = 3x^3 + 4x^2 - 5x + 2 by the linear factor (x - 1). We can utilize synthetic division to simplify the expression:

1 | 3 4 -5 2 | 3 7 2 |---------- 3 7 2 4

The outcome of the synthetic division is the quotient polynomial 3x^2 + 7x + 2 and the remainder 4. Therefore, we can state f(x) as:

f(x) = (x - 1)(3x^2 + 7x + 2) + 4

### Example 2: Long Division

Example 2: Long Division

Let's assume we want to divide the polynomial f(x) = 6x^4 - 5x^3 + 2x^2 + 9x + 3 with the polynomial g(x) = x^2 - 2x + 1. We can utilize long division to streamline the expression:

To start with, we divide the largest degree term of the dividend with the largest degree term of the divisor to obtain:

6x^2

Subsequently, we multiply the entire divisor by the quotient term, 6x^2, to get:

6x^4 - 12x^3 + 6x^2

We subtract this from the dividend to get the new dividend:

6x^4 - 5x^3 + 2x^2 + 9x + 3 - (6x^4 - 12x^3 + 6x^2)

which streamlines to:

7x^3 - 4x^2 + 9x + 3

We recur the procedure, dividing the highest degree term of the new dividend, 7x^3, with the highest degree term of the divisor, x^2, to obtain:

7x

Subsequently, we multiply the total divisor with the quotient term, 7x, to obtain:

7x^3 - 14x^2 + 7x

We subtract this of the new dividend to get the new dividend:

7x^3 - 4x^2 + 9x + 3 - (7x^3 - 14x^2 + 7x)

which simplifies to:

10x^2 + 2x + 3

We recur the process again, dividing the highest degree term of the new dividend, 10x^2, by the largest degree term of the divisor, x^2, to obtain:

10

Then, we multiply the whole divisor by the quotient term, 10, to get:

10x^2 - 20x + 10

We subtract this of the new dividend to obtain the remainder:

10x^2 + 2x + 3 - (10x^2 - 20x + 10)

which simplifies to:

13x - 10

Therefore, the result of the long division is the quotient polynomial 6x^2 - 7x + 9 and the remainder 13x - 10. We can state f(x) as:

f(x) = (x^2 - 2x + 1)(6x^2 - 7x + 9) + (13x - 10)

## Conclusion

Ultimately, dividing polynomials is an important operation in algebra which has several uses in various domains of math. Getting a grasp of the different methods of dividing polynomials, for instance synthetic division and long division, could support in working out intricate problems efficiently. Whether you're a learner struggling to get a grasp algebra or a professional operating in a field which involves polynomial arithmetic, mastering the theories of dividing polynomials is crucial.

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