# 2.8 The Reciprocal of a Real Number - PowerPoint PPT Presentation

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2.8 The Reciprocal of a Real Number. Objective : To simplify expressions involving reciprocals. Warm – up : Multiply: 1) 20(-5) 2 ) 7 a (-3 b ) 3) 76(-85)(0) 4 ) (-3 + 8 y )(-2) 5) (-1)(-4 x – y + 7) 6 ) 3 x (2 + 5). 2.8 The Reciprocal of a Real Number. Definition.

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2.8 The Reciprocal of a Real Number

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### 2.8 The Reciprocal of a Real Number

• Objective: To simplify expressions involving reciprocals.

• Warm – up: Multiply:1) 20(-5)2) 7a(-3b)3) 76(-85)(0)4) (-3 + 8y)(-2)5) (-1)(-4x – y + 7)6) 3x(2 + 5)

### 2.8 The Reciprocal of a Real Number

Definition

State the reciprocal of the following.

7

-9

6

-⅘

-1

0.25

• Two numbers whose product is 1 are called reciprocals(or multiplicative inverses) of each other.

• What number time ½ equals 1? That number is the reciprocal of ½!

• Property of Reciprocals:

### 2.8 The Reciprocal of a Real Number

Simplify the following. Are they reciprocals?

### 2.8 The Reciprocal of a Real Number

• Homework:

• Pg. 81 Written Exercises #1 – 33 odd