### LESSON 7-2 PROBLEM SOLVING FACTORING BY GCF

Factor a polynomial with four terms by grouping. What do you think? Likewise to factor a polynomial , you rewrite it as a product. Factor out the common binomial. Rewrite the polynomial expression using the factored terms in place of the original terms. You can then use the distributive property to rewrite the polynomial in a factored form. Note how they all have an x , so it look like x will be involved.

Sum of the products: Find the greatest common factor of 56 xy and 16 y 3. Rewrite each term as the product of the GCF and the remaining terms. We can also do this with polynomial expressions. Notice that both factors here contain the term x. Factoring is to write an expression as a product of factors.

Notice that you arrive at the same simplified form whether you factor out the GCF immediately or if you pull out factors individually.

The GCF for a polynomial is the largest monomial that sooving is a factor of each term of the polynomial. In the example above, each pair can be factored, but then there is no common factor between the pairs!

Notice that in the example below, the first term is x 2and x is the only variable present. Factor 45 c 2 d 2. So our numerical GCF is 3. The entire term xy 3 is not a factor of either monomial. You can then use the distributive property to rewrite the polynomial in a factored form.

In the next two tutorials we will add on other types of factoring.

## Factoring polynomials by taking a common factor

We have a 3, 9, and When factoring a four-term polynomial using grouping, find the common factor of pairs of terms rather than the whole polynomial.

Prohlem will be asking you for help with factoring. As you look at the examples of simple polynomials below, try to identify factors that the terms of the polynomial have in common. Notice that when you factor two terms, the result is a monomial times lessoon polynomial.

Answer Cannot be factored.

We have to decide which exponent we are going to use. You will need to divide monomials in order to factor polynomials.

# Factoring Out the Greatest Common Factor

Need Extra Help on these Topics? Connect and Follow Algebra Class. Factor out a GCF from each separate binomial. Before we get started, it may factorinh helpful for you to review the Dividing Monomials lesson.

Sum of the products: The two groups 7 x x — 3 and 5 x — 1 do not have any common factors, so this polynomial cannot be factored any further. However, what do you do if the terms within the polynomial do not share any common factors?

If we use the exponent 8, we are in trouble. Math works just like anything else, if you want to get good at it, then you need to practice it.

Same process, you just have to be careful to look at all the variables. Group the first two terms together and then the last two terms together. Students Homeschool Adults Teachers. Just as any integer can be written as the product of factors, so provlem can any monomial or polynomial be expressed as a product of factors.

The values 8 and 11 share no common factors, but the GCF of a 6 and a 5 is a 5. Notice that both factors here contain the term x. This process is called the grouping technique. You correctly identified 5 b as a factor of one pair, leaving 2 a and 1, and 4 as the factor of the other pair, also leaving 2 a and 1. Their greatest common factor is 10, since 10 is the greatest factor that both numbers have in common.