# Adding and Subtracting Rational Expressions with Unlike Denominators Part 2

### Objectives:

• Students will review the basics of finding common denominators.

• Students will review adding/subtracting rational numbers with unlike denominators.

• Students will learn how to find a common denominator when adding/subtracting rational expressions.

• Students will review factoring when adding/subtracting rational expressions.

• Students will practice all of these skills in their independent work.

### Lesson Procedure:

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

### Lesson Excerpt:

Rational Numbers with Trinomials

- "The next type of problem that we are going to learn to add/subtract are rational numbers that have trinomials in them. We are going to be using the same skills that we have been when working with monomials and binomials, except we will need to factor the trinomials first. Let's look at an example."

- On Board: x + 1 + 6
x2 + 8x + 7 x + 7

- "Now we are going to be adding these two rational expressions, but before we can do that, we need to factor the trinomial into two binomials. This will give us the information we need to find the LCD."

Continued...

## Lesson Printables:

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