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Finding the cube and finding the cube root are inverse operations.
cube Think Smart
The cube root of a
2 8
number is the same
cube root as the number itself.
What is the number?
10
CHAPTER
3
Complete each of the following:
(a) 4 × 4 × 4 = 64 (b) (– 0.5) × (– 0.5) × (– 0.5) = – 0.125
3
3
Thus 64 = 3 × × Thus – 0.125 = 3 × ×
= =
1
(c) 1 2 3 = 1
6 216
Thus 3 1 = 3
216
=
3
3
3
3
(a) 64 = 4 × 4 × 4 (b) – 0.125 = – 0.5 × (– 0.5) × (– 0.5)
= 4 = – 0.5
1 1 3
(c) 3 = 3 1 2
216 6
1
=
6
Self Practice 3.2b
1. Copy and complete each of the following:
(a) 8 × 8 × 8 = 512 (b) 0.3 × 0.3 × 0.3 = 0.027
3
3
Thus, 512 = 3 × × Thus, 0.027 = 3 × ×
= =
1
1
(c) – 1 2 3 = –
2 8
1
Thus, 3 – = 3
8
=
62
Chapter 3
03 TB Math F1.indd 62 11/10/16 12:09 PM
