G8

Copyright © Swun Math Grade 8 Unit 2 Lesson 10 C TE

Answer Key

Homework

1. 푥푥^3 = 49
   �^3 푥푥^3 =√^349
   √^3 푥푥⋅푥푥⋅푥푥=√^349
   푥푥=^3 √ 49 ; irrational

2. 512 =푏푏^3

(^3) √ 512 =� (^3) 푏푏 (^3)
(^3) √ 8 ⋅ 8 ⋅ 8 = (^3) √푏푏⋅푏푏⋅푏푏
8 =푏푏; rational

3. 푓푓^3 = 64

�^3 푓푓^3 =√^364

�^3 푓푓⋅푓푓⋅푓푓=^3 √ 4 ⋅ 4 ⋅ 4

푓푓= 4 ; rational

4. ℎ^3 = 15

(^3) �ℎ (^3) = (^3) √ 15
(^3) √ℎ⋅ℎ⋅ℎ=√ (^315)
ℎ=^3 √ 15 ; irrational

5. 푘푘^3 = 100
   �^3 푘푘^3 =√^3100
   √푘푘⋅푘푘⋅푘푘^3 =^3 √ 100
   푘푘=^3 √ 100 ; irrational

6. 푔푔^3 = 1

(^3) �푔푔 (^3) =√ (^31)
(^3) �푔푔⋅푔푔⋅푔푔=^3 √ 1
푔푔= 1; rational