# LESSON 7-2 PROBLEM SOLVING FACTORING BY GCF

That is ok, we treat it in the same manner that we do when we have a monomial GCF. The GCF of two numbers is the greatest number that is a factor of both of the numbers. The method that you choose, depends on the make-up of the polynomial that you are factoring. To factor a number is to rewrite it as a product. Rewrite the polynomial expression using the factored terms in place of the original terms. In this case, it does check out. At the link you will find the answer as well as any steps that went into finding that answer. The values 8 and 11 share no common factors, but the GCF of a 6 and a 5 is a 5. We can also do this with polynomial expressions. Rewrite the polynomial expression using the factored terms in place of the original terms. Factors are the building blocks of multiplication. Product of a number and a sum: When factoring 5 b out of 10 ab and 5 b , the remaining 2 a and 1 must still be added and multiplied by the common factor 5 b:

Finding the greatest common factor in a set of monomials is not very different from finding the GCF of two whole numbers. Factors are the building blocks of multiplication. To find the GCF of greater numbers, you can factor each number to find their prime factors, identify the prime problsm they have in common, and then multiply those together.

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Notice that both factors here contain the term x. Sum of the products: In the example above, each pair can be factored, but then there is no common factor between the pairs! The next lesson is on factoring by using grouping. Think of numbers that are factors of both 56 and From a previous example, you found the GCF of 25 b 3 and 10 b 2 to be 5 b 2. To be in factored form, it must be written as a product of factors. To factor a polynomial, first identify the greatest common factor of the terms, and then apply the distributive property to rewrite the expression.

# Greatest Common Factor

Find the GCF of the first pair of terms. Example Problem Find the greatest common factor of 25 b 3 and 10 b 2. The distributive property allows you to factor out common factors. The largest monomial that we can factor out of each term is.

When the first term of the second group of two has a minus sign in front of it, you want to put the minus in front of the second. Factor a polynomial with four terms by grouping. Rewrite each term as the product of the GCF aolving the remaining terms. You will need to divide monomials in order to factor polynomials. Need Extra Help on these Topics? If we use the exponent 8, we are in trouble.

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## Try Factor a Polynomial by Finding Its Greatest Common Factor

B 8 y Correct. How to Succeed in a Math Class for some more suggestions. In the next two tutorials we will add on other types of factoring. To factor a number is to rewrite it as a product.

This process is basically the reverse of the distributive property found in Tutorial 5: Rewrite problek polynomial using the factored terms in place of the original terms. The correct answer is 8 y. Factor the GCF, 4 aout of the first group.

## Factoring by grouping

Note that if we multiply our answer out, we should get the ssolving polynomial. Factoring is very helpful in simplifying and solving equations using polynomials. Practice Problems 1a – 1d: Factor 45 c 2 d 2.

Just as any integer can be written as the product of factors, so too can any monomial or polynomial be expressed as a product of factors. In this case, it does check out.