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6. Nth root by prime factorization method example ( Enter your problem )

1. Example-1





1. Find 4th root of 10000 using prime factorization method

Solution:
First find factors of 10000
210000
25000
22500
21250
5625
5125
525
55
 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 method

Solution:
First find factors of 4096
24096
22048
21024
2512
2256
2128
264
232
216
28
24
22
 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 method

Solution:
First find factors of 64
264
232
216
28
24
22
 1



`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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