Here's the question you clicked on:
astromanticspin
rationalize the denominator: ∛7 / ∛100s
You just need to multiply the numerator and denom by the radical in the denom
\[\sqrt[3]{70x^{2}}/(10x)\]
That comes from multiplying numerator and denominator by \[\sqrt[3]{10x^{2}} \]and then sinplifying.
The x's should be s's. My typo.