# 7-2 PROBLEM SOLVING FACTORING BY GCF

Factor out the common binomial. 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. When factoring a four-term polynomial using grouping, find the common factor of pairs of terms rather than the whole polynomial. As shown above when we divide 2 x by 2 x we get 1, so we need a 1 as the third term inside of the. When two or more monomials are combined either added or subtracted , the resulting expression is called a polynomial. The process of breaking a number down into its prime factors is called prime factorization.

As you look at the examples of simple polynomials below, try to identify factors that the terms of the polynomial have in common. Introduction Factoring is to write an expression as a product of factors. When factoring a four-term polynomial using grouping, find the common factor of pairs of terms rather than the whole polynomial. Factor the common factor, x , out of the first group and the common factor, 4, out of the second group. And then what’s the greatest, I guess, factor, what’s the greatest degree of x that’s divisible into all three of these? Factor the common factor 3 x out of first group.

Factor a polynomial with four terms by grouping. Notice that in the example below, the first term is x 2and x is the only variable present.

Note that if we multiply our answer out, we do get the original polynomial. 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.

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Factoring by common factor review. Here it’s trivially simple. Divide the GCF out of every term of the polynomial.

# Factoring polynomials: how to find common factor (video) | Khan Academy

We need to figure out what the largest monomial that we can factorijg out of each of these terms would be. When factoring 5 b out of 10 ab and 5 bthe remaining 2 a and 1 must still be added and multiplied by the common factor 5 b: Well, factring 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.

So x squared is going to be the greatest common x degree in all of them. So let’s see, it’s going to be 2x squared times– and what’s this guy divided by 2x squared?

The correct answer is a 5 8 a — That’s the largest degree of x. Factoring is to write an expression as a product of factors. We have a 3, 9, and 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 the common factor, xout of the first group and the common factor, 4, out of the second group. At the link you will find the answer as well as any steps that went into finding that answer. B 8 y Correct.

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. So in the other videos, we looked at it in terms of breaking it down to its simplest parts, but I think we have proboem practice now to be able to do a little bit more of it in our heads.

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Math Algebra I Factorization Factoring polynomials by taking common factors.

## Factoring by grouping

Notice that when you factor two terms, the result is a monomial times a polynomial. Notice that you arrive at the same simplified form whether you factor out the GCF immediately or if you pull factofing factors individually. It involves organizing the polynomial in groups.

The method remains the same: If you just multiply this out, you get 4xy. The GCF for a polynomial is the largest monomial that divides is a factor of each term of the polynomial. Factor out the 5 b 2.

## Greatest Common Factor (GCF) Calculator

Factor 45 c 2 d 2. C a 5 a — 1 Incorrect. Pulling out common factors, you find: Example Problem Find the greatest common factor of and When we divide it out of the second term, we are left with So let me rewrite fatcoring.

Well, all of these are divisible by x squared.