The problem I found on the site was:
Let $h(x) = 4\sqrt[4]{x^5}$. Find $h'(x)$.
I got the answer $h'(x) = \frac{5x^4}{\sqrt[4]{x^{15}}}$ and the site told me it was the correct answer. However, when I looked at what the correct answer was it told me it was $5x^\frac{1}{4}$. Therefore, I would assume that $\frac{5x^4}{\sqrt[4]{x^{15}}} = 5x^\frac{1}{4}$, but I don't understand how? The only simplification I could determine is $\frac{5x^4}{x^{\frac{15}{4}}}$. Can somebody show me the step by step simplification to get from my answer to their answer?