1. Find 4th root of 10000 using prime factorization methodSolution:First find factors of 10000
| 2 | 10000 |
| 2 | 5000 |
| 2 | 2500 |
| 2 | 1250 |
| 5 | 625 |
| 5 | 125 |
| 5 | 25 |
| 5 | 5 |
| | 1 |
`10000 = 2 × 2 × 2 × 2 × 5 × 5 × 5 × 5`
`10000 = 2^4 * 5^4`
`root (4)(10000) = root (4)(2^4 * 5^4)` (Taking 4th root)
`= 2 × 5`
`= 10`
2. Find 4th 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 4th root
`:. root (4)(4096)=root (4)(2^12)`
`=2^3`
`=8`
`:.` 4096 is a perfect `4^(th)` power
3. Find 3rd 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
This material is intended as a summary. Use your textbook for detail explanation.
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