Divide the GCF out of every term of the polynomial. Let me factor an x squared out. Think of numbers that are factors of both 56 and Factor out the common factor, 2 x — 3 , from both terms. If there is no common factor for all of the terms in the polynomial, another technique needs to be used to see if the polynomial can be factored.

Notice that both factors here contain the term x. Putting this together we have a GCF of 3 xy. This process is called the grouping technique. B 8 y Correct. That’s the largest degree of x. So let’s write that down. Practice Problems 1a – 1d:

And then you have y divided by say, 1, is just y. Product of a number and a sum: The values 8 and 11 share no common factors, but the GCF of a 6 and a 5 is a 5.

Factoring polynomials by taking a common factor

If you want to test this, go ahead and divide both and by 42—they are both evenly divisible by this number! Notice that when you factor two terms, the result is a monomial times a polynomial. The distributive property allows you to factor out common factors.

The GCF of two numbers is the greatest number that is a factor of both of the numbers. Note that if you do not factor the greatest common factor at first, you probldm continue factoring, rather than start all over.


7-2 problem solving factoring by gcf

Example Problem Find the greatest common factor of 81 c 3 d and 45 c 2 d 2. This process is basically the reverse of the distributive property found in Tutorial 5: Practice Problems 1a – 1d: To log in and use all the features of Khan Academy, please enable JavaScript in your browser. When we divide it out of the second term, we are left with Factor 81 c 3 d. In the example above, each pair can be factored, but then there is no common factor between the pairs!

7-2 problem solving factoring by gcf

This just simplifies to 2x squared right there, or this 2x squared times 1. And then you have minus 8 divided by 2 is 4.

Need Extra Help on these Topics? Something to look forward to! You might say OK, let me look at each of these. To find the GCF of greater numbers, you can factor each number to find their prime factors, identify the prime factors they have in common, and then multiply those together. Factor out the GCF: Find the greatest common factor of 56 xy and 16 y 3.

Factoring by grouping

Think of numbers that are factors of both 56 and A prime factor is similar to a prime number —it has only itself and 1 as factors. And the reason why I kind of of went through great pains to show you exactly what we’re doing is so you know exactly what we’re doing. That simplifies to 1, maybe I should write it below. Factor a polynomial with four terms by grouping.


They are the numbers that you can multiply together to produce another number: Well, these two guys are divisible by y, but this guy isn’t, so there is no degree of y that’s divisible into all of them. Identify the GCF of the polynomial. Factor out a Solvjng from each separate binomial.

Factoring Out the Greatest Common Factor

And we say, well, the largest, of, the largest common factor of 2, 8 and 4 is 2. Answer Cannot be factored. Sum of the products: So what we can do now is we can think about each of these terms as the product of the 2x squared and something else.

7-2 problem solving factoring by gcf

In the future, you might be able to do this a little bit quicker.