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Is it correct to write sqrt(sqrt(x)) as equation/formula ? or root4(x) ?

I mean if x = 10000 it will be 10

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One can write it as $x^{1/4}$, or as $\sqrt[4]{x}$; if you are asking about $\LaTeX$ code, the code for the latter is \sqrt[4]{x}. –  Arturo Magidin Apr 5 '12 at 15:10
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1 Answer

up vote 5 down vote accepted

It's not wrong to write $\sqrt{\sqrt{x}}$ in the same way that it's not wrong to write $\sqrt{\sqrt{\frac{2x^1}{2}}}$, but it's generally preferable to write expressions as simply as possible.

The phrase "square root" means the same thing as "one-half power". So,

$$ \sqrt{\sqrt{x}} = \sqrt{x^{1/2}} = (x^{1/2})^{1/2} = x^{1/2 \cdot 1/2} = x^{1/4}. $$

For the same reason as with square root, it would be appropriate to write either $x^{1/4}$ or $\sqrt[4] x$.

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