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Radicals. Simplify the expression. Give the exact value in simplified form. Rationalize...

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schooledmom | Salutatorian

Posted June 12, 2013 at 12:52 PM via web

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Radicals. Simplify the expression. Give the exact value in simplified form. Rationalize any demoninators.

the square root of 343x ^13

Tagged with algebra 1, math

3 Answers | Add Yours

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llltkl | College Teacher | Valedictorian

Posted June 12, 2013 at 1:31 PM (Answer #2)

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`sqrt(343x ^13)`

`=sqrt(7^3*x^13)`

To simplify a square root, "take out" anything that is a "perfect square" that is, you take out front anything that has two copies of the same factor:

`sqrt(7^2*7*x^2*x^2*x^2*x^2*x^2*x^2*x)`

`=7*x^6sqrt(7*x)`

`=7x^6sqrt(7x)`

This is the required answer.

Sources:

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rakesh05 | High School Teacher | (Level 1) Assistant Educator

Posted June 13, 2013 at 3:54 PM (Answer #4)

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`sqrt(343x^13)` =`sqrt(7^3 x^13)`

                 `=(7^2 7.x^12 x)^(1/2)`      

(by law of the exponent  `(x^m)^n=x^(mn)` .)

                 `=7x^6(7x)^(1/2)`

                 `=7x^6 sqrt(7x)`

               

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aruv | High School Teacher | Valedictorian

Posted June 12, 2013 at 1:05 PM (Answer #1)

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question is

`sqrt(343x^13)=sqrt(7xx7xx7xx x^13)`

`=(7^3xx x^13)^(1/2)`

`=(7^3)^(1/2)xx (x^13)^(1/2)`

`=7(7)^(1/2)xx x^6 (x)^(1/2)`

`=7x^6sqrt(7x)`

`you can`

`apply`

`(x^m)^n=x^(mn)`  rule.

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