Use the distributive property

Oct 13, 2025 by windailys.com 116 views

Introduction

Factoring polynomials is a fundamental concept in algebra that involves expressing a polynomial as a product of simpler polynomials. In this article, we will explore the process of factoring polynomials and apply it to a given polynomial to determine its completely factored form.

What is Factoring?

Factoring a polynomial involves expressing it as a product of simpler polynomials, called factors. Each factor is a polynomial that, when multiplied together, results in the original polynomial. Factoring polynomials is an essential skill in algebra, as it allows us to simplify complex expressions, solve equations, and analyze functions.

The Process of Factoring

The process of factoring a polynomial typically involves the following steps:

Look for common factors: Identify any common factors in the polynomial, such as a greatest common factor (GCF) or a common binomial factor.
Use the distributive property: Use the distributive property to expand the polynomial and identify any patterns or relationships between the terms.
Identify patterns: Look for patterns in the polynomial, such as a difference of squares or a sum of cubes.
Use factoring techniques: Apply various factoring techniques, such as factoring by grouping, factoring by substitution, or factoring by using the quadratic formula.

Factoring the Given Polynomial

The given polynomial is:

$x^3 + 3x^2 - 6x - 18$

To factor this polynomial, we can start by looking for common factors. In this case, there are no common factors, so we can proceed to use the distributive property to expand the polynomial.

Step 1: Expand the Polynomial

Using the distributive property, we can expand the polynomial as follows:

$x^3 + 3x^2 - 6x - 18 = (x^3 + 3x^2) - (6x + 18)$

Step 2: Identify Patterns

Looking at the expanded polynomial, we can identify a pattern. The first two terms, $x^3 + 3x^2$ , can be factored as a difference of cubes:

$x^3 + 3x^2 = x^2(x + 3)$

The last two terms, $-6x - 18$ , can be factored as a difference of squares:

$-6x - 18 = -6(x + 3)$

Step 3: Factor the Polynomial

Now that we have identified the patterns, we can factor the polynomial as follows:

$x^3 + 3x^2 - 6x - 18 = x^2(x + 3) - 6(x + 3)$

Using the distributive property, we can factor out the common binomial factor $(x + 3)$ :

$x^3 + 3x^2 - 6x - 18 = (x^2 - 6)(x + 3)$

Conclusion

In this article, we have explored the process of factoring polynomials and applied it to a given polynomial to determine its completely factored form. We have identified common factors, used the distributive property, and applied various factoring techniques to factor the polynomial. The completely factored form of the polynomial is:

$(x^2 - 6)(x + 3)$

This result is consistent with option B in the given multiple-choice question.

Final Answer

The completely factored form of the polynomial $x^3 + 3x^2 - 6x - 18$ is:

Introduction

In our previous article, we explored the process of factoring polynomials and applied it to a given polynomial to determine its completely factored form. In this article, we will provide a Q&A guide to help you better understand the concept of factoring polynomials and how to apply it to various problems.

Q: What is factoring in algebra?

A: Factoring in algebra involves expressing a polynomial as a product of simpler polynomials, called factors. Each factor is a polynomial that, when multiplied together, results in the original polynomial.

Q: Why is factoring important in algebra?

A: Factoring is an essential skill in algebra because it allows us to simplify complex expressions, solve equations, and analyze functions. By factoring polynomials, we can identify patterns and relationships between the terms, which can help us solve problems more efficiently.

Q: What are the different types of factoring techniques?

A: There are several types of factoring techniques, including:

Factoring by grouping: This involves grouping terms together and factoring out common factors.
Factoring by substitution: This involves substituting a variable with an expression and factoring the resulting polynomial.
Factoring by using the quadratic formula: This involves using the quadratic formula to factor quadratic expressions.

Q: How do I know which factoring technique to use?

A: The choice of factoring technique depends on the type of polynomial and the pattern it exhibits. For example, if the polynomial is a quadratic expression, you may use the quadratic formula to factor it. If the polynomial is a difference of squares, you may use the difference of squares formula to factor it.

Q: What are some common patterns in polynomials?

A: Some common patterns in polynomials include:

Difference of squares: This involves a polynomial of the form $a^2 - b^2$ , which can be factored as $(a + b)(a - b)$ .
Sum of cubes: This involves a polynomial of the form $a^3 + b^3$ , which can be factored as $(a + b)(a^2 - ab + b^2)$ .
Difference of cubes: This involves a polynomial of the form $a^3 - b^3$ , which can be factored as $(a - b)(a^2 + ab + b^2)$ .

Q: How do I factor a polynomial with multiple variables?

A: Factoring a polynomial with multiple variables involves using the distributive property and factoring out common factors. For example, if you have a polynomial of the form $x^2y + 3xy^2$ , you can factor out the common factor $xy$ to get $xy(x + 3y)$ .

Q: What are some common mistakes to avoid when factoring polynomials?

A: Some common mistakes to avoid when factoring polynomials include:

Not factoring out common factors: Make sure to factor out common factors, such as a greatest common factor (GCF) or a common binomial factor.
Not using the distributive property: Use the distributive property to expand the polynomial and identify patterns.
Not checking for patterns: Look for patterns in the polynomial, such as a difference of squares or a sum of cubes.

Conclusion

In this article, we have provided a Q&A guide to help you better understand the concept of factoring polynomials and how to apply it to various problems. By following the tips and techniques outlined in this article, you can improve your skills in factoring polynomials and become more confident in your ability to solve algebraic problems.

Final Tips

Practice, practice, practice: The more you practice factoring polynomials, the more comfortable you will become with the process.
Use online resources: There are many online resources available to help you learn and practice factoring polynomials, including video tutorials and practice problems.
Seek help when needed: Don't be afraid to ask for help if you are struggling with a particular problem or concept.