Factoring Trinomials: Quadratic Trinomials

Lesson Procedure:

Print the classroom lesson plan and worksheet questions (see below).

Lesson Excerpt:

Factoring Trinomials using GCF

- “Now we are going to move on to today’s lesson. These trinomials are often called quadratic trinomials, and we will get more into quadratics in a later lesson. The important thing to note is that these trinomials will need to be factored differently, because they have different terms. Here is an example to show you what I mean.”
- On Board: 6x2 + 12x – 18
- “Now this trinomial can’t be factored the same way because there is a term in front of the x2. Sometimes when factoring trinomials, you will need to see if there is a greatest common factor to pull out of all three terms. Looking for a greatest common factor is the first step in factoring these trinomials. Let’s look at our example. Is there a greatest common factor between 6, 12, and 18?”

Continued...