Prove, using only the definition of $O()$, that $2^{\sqrt{x}}$ is not $O(x^{10})$ Prove, using only the definition of $O()$, that $2^{\sqrt{x}}$ is not $O(x^{10})$.

I have been doing a few exercises on Big O and this is the first time I have encountered the variable in the exponent.  I was wondering how to disprove this function.  Any help would be appreciated
Hint: Try converting both functions to the form $e^{f'(x)}$.