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Question
Find the cube root of the following number by the prime factorisation method.
13824
Solution
| 2 | 13824 |
| 2 | 6912 |
| 2 | 3456 |
| 2 | 1728 |
| 2 | 864 |
| 2 | 432 |
| 2 | 216 |
| 2 | 108 |
| 2 | 54 |
| 3 | 27 |
| 3 | 9 |
| 3 | 3 |
| 1 |
Prime factorisation of 13824 = 2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 ×2 × 3 × 3 × 3
= 23 × 23 × 23 × 33
= (2 × 2 × 2 × 3)3
∴ `root3 (13824)`
= 2 × 2 × 2 × 3
= 24
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