1. Find Cube root of 64 using prime factorization methodSolution:First find factors of 64
`64=2 xx 2 xx 2 xx 2 xx 2 xx 2`
`64=2^6`
Taking cuberoot
`:. root (3)(64)=root (3)(2^6)`
`=2^2`
`=4`
`:.` 64 is a perfect cube
2. Find Cube root of 125 using prime factorization methodSolution:First find factors of 125
`125=5 xx 5 xx 5`
`125=5^3`
Taking cuberoot
`:. root (3)(125)=root (3)(5^3)`
`=5`
`:.` 125 is a perfect cube
3. Find Cube root of 1000 using prime factorization methodSolution:First find factors of 1000
`1000 = 2 × 2 × 2 × 5 × 5 × 5`
`1000 = 2^3 * 5^3`
`root (3)(1000) = root (3)(2^3 * 5^3)` (Taking cuberoot)
`= 2 × 5`
`= 10`
4. Find Cube root of 4096 using prime factorization methodSolution:First find factors of 4096
| 2 | 4096 |
| 2 | 2048 |
| 2 | 1024 |
| 2 | 512 |
| 2 | 256 |
| 2 | 128 |
| 2 | 64 |
| 2 | 32 |
| 2 | 16 |
| 2 | 8 |
| 2 | 4 |
| 2 | 2 |
| | 1 |
`4096=2 xx 2 xx 2 xx 2 xx 2 xx 2 xx 2 xx 2 xx 2 xx 2 xx 2 xx 2`
`4096=2^12`
Taking cuberoot
`:. root (3)(4096)=root (3)(2^12)`
`=2^4`
`=16`
`:.` 4096 is a perfect cube
This material is intended as a summary. Use your textbook for detail explanation.
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