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» » Factoring Trinomials

Factoring Trinomials

Lesson 3 in the "Factoring Series"

Factoring trinomials is probably the most common type of factoring in Algebra. In Algebra 1 we will factor trinomials that have a lead coefficient of 1. In Algebra 2, we will progress to factoring more complex trinomials whose lead coefficient is greater than 1.

To begin this lesson, it is important for you to understand the process of multiplying binomials using the FOIL method. Please be sure to review that lesson before starting this lesson.

The diagram below outlines the product of multiplying two binomials.

It's important to understand how we reach the trinomial because in this lesson we are going to work backwards to form the factors or two binomials.

Result of Multiplying Two Binomials

factoring trinomials

Did you notice how we added the two last terms of each binomial (3 & 5) to get the middle term and we multiplied the same two last terms (3 & 5) in order to get the last term of the trinomial?

Ok, now let's work backwards. You will be given the trinomial and in order to factor the trinomial, you will need to work backwards to find the two binomials. Let's look at an example.

Example 1

factoring trinomials example

Just 3 easy steps to factoring trinomials. Let's take a look at another example. This example is a little more difficult because we will be working with negative and positive numbers.

Example 2

factoring trinomials
factoring trinomials


When you have a trinomial with a minus sign, pay careful attention to your positive and negative numbers. In the example above, 8 and -2 are the numbers that we needed to complete our binomials; however, -8 and 2 would not have worked!

I know that factoring trinomials is tough, so let's look at one more example. Again, this trinomial will contain a minus sign, so pay careful attention to the positive and negative numbers that you choose.

Example 3

factoring trinomials
factoring trinomials

Need Extra Help with Factoring?

Enter your expression and click "Factor".

Great Job! You have completed the Algebra 1 Polynomials Unit!

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