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Mathematics 8 Online
OpenStudy (anonymous):

how are exponents related to taking the root of a number?

OpenStudy (shadowfiend):

Depending on how you look at it, they're the opposite.

OpenStudy (anonymous):

taking the square root of a number is the inverse of squaring the number

OpenStudy (anonymous):

the root of a number can be represent by raising a number to a fractional exponent

OpenStudy (shadowfiend):

So, for example, if I raise a to the 8th power, \(a^8\), then I can get \(a\) back by taking the 8th root of the result: \(\sqrt[8]{a^8} = a\).

OpenStudy (shadowfiend):

As Dockworker points out, another way to look at it is that a root is actually just another kind of exponent—a fractional one. So \(\sqrt[8]{a} = a^{\frac{1}{8}}\).

OpenStudy (anonymous):

okay i understand now thank u very much

OpenStudy (shadowfiend):

If we look at it this way, \(\sqrt[8]{a^8} = (a^8)^{\frac{1}{8}} = a^{\frac{8}{8}} = a^1 = a\).

OpenStudy (shadowfiend):

Cool stuff. Make sure to give a medal by clicking “good answer” when you see a good answer :)

OpenStudy (shadowfiend):

Aw thanks :)

OpenStudy (anonymous):

haa anytime

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