Multiplicative inverse (1) work.notebook
Objective: Know difference between multiplicative inverse, additive inverse, simplifying rational expressions and undefined.
Chapter 2 Rational Numbers
A rational number is a number in the form where a and b integers and b ≠ 0.
b there is a multiplicative inverse or reciprical such
.
b a a
Additive inverse remember is x + (x) = 0!!!
Find the multiplicative inverse of the following:
1)
3
/
4
4) 1
2)
5
/
8
5)
1
/
7
3) 5 6) 3
2
/
5
Multiplicative inverse (1) work.notebook
A number is a rational number if and only if it can be written as an infinitely repeating decimal.
1)
2
/
9
4)
1
/
2
5)
15
/
5
2)
1
/
7
3)
4
/
33
6) 3
Multiplicative inverse (1) work.notebook
Simplifying Rational Expressions
1) Factor both the numerator and denominator.
2) Divide both by their GCF by "cancelling" the common factor.
Examples
1) 3x 12
3x
2) 2x 8 x
2
8x + 16
Factors that are Opposites
Either factor out the negative or remeber that = 1
(b a)
Examples:
1) 2 a
a
2
4
2) 8 2x x
2
8x + 16
Multiplicative inverse (1) work.notebook
Undefined
Undefined is when a rational expression has no meaning. There is no meaning when a denominator equals zero.
Examples: When are the following undefined?
1) x + 5 2) a
2
1 3) y 1
2x 4ab y
2
5y + 6
Homework Part 2: Pg 47 48 # 1 29 odd