7.2 properties of rational exponents 3/4/2013. example 1 use properties of rational exponents a. 6...
TRANSCRIPT
Example 1 Use Properties of Rational Exponents
a. 62/3 • 61/3 = 6(2/3 + 1/3) = 63/3 = 61 = 6
b. (33/4)4 = 3(3/4 4)• = 33 = 27
c. (16 • 25)1/2 = 20= 161/2 • 251/2 = 4 • 5
d. 8 1/3–1
=81/3
=2
1
e.71/2
75/2
= 7(5/2 1/2)– = 74/2 = 72 = 49
Fifth RootPerfect Fifth1 = 15
32 = 25
243 = 35
1024 = 45
3125 = 55
5√1=15√32=25√243=35√1024=45√3125=5
Example 2 Use Properties of Radicals
a. 33 • 93
= 3 Simplify.
= 4
3
48 Quotient property of radicals
= 2 Simplify.
= 33 • 9 Product property of radicals
= 33 • 3 Factor.• 3
b.4 48
34
= 24 • 2 Divide and factor.• 2 • 2
4 16
3 33
4 42
𝑜𝑟 3√3 ∙ 9= 3√27=3
2
Example 3 Write Radicals in Simplest Form
a. 3 40 = 83 • 5 Factor out a perfect cube.
= Separate the product83 • 53
= 2 Simplify.53
5√64b. = Factor out a perfect fifth.
=
Checkpoint
Simplify the expression.
Use Properties of Radicals and Rational Exponents
ANSWER 2
ANSWER 2
ANSWER 3
ANSWER 3
1. 23 • 43
2. 45 • 85
3. 543
23
4. 813
33
Example 5 Simplify Expressions with Variables
a. 9x 6
Simplify the expression. Write your answer using positive exponents only. Assume all variables are positive.
= 3x 3 Simplify.
b. 4y 6 ( )1/2 = 41/2 y 6 ( )1/2 Power of a product property
= Power of a power propertyy (6 · 1/2)
= 2y 3 Simplify.
= Break into perfect square factors.
Example 5 Simplify Expressions with Variables
c. 3
y 6
x 3
=x
y 2 Simplify.
d.ac 2
3a 3/2 c
–
Quotient of powers property3a (3/2 1)c [1 ( 2)]= – – –
Simplify.3a 1/2c 3=
Factor out perfect cube factors.¿3√𝑥3
3√𝑦3 ∙ 𝑦3
¿3√𝑥3
3√𝑦3 ∙3√𝑦3
Checkpoint
Simplify the expression. Write your answer using positive exponents only. Assume all variables are positive.
ANSWER 5y 2
ANSWER 2uv 3
1. 25y 4
ANSWER 2x 2/3z 3
Simplify Expressions with Variables
2. y 2
x 6ANSWER
yx 3
3. 8u 3v 9( )1/3
4. 2xx 1/3z 3–