I'll just write u. I'll write the whole thing. U-substitution could be the tool of choice. So given that, what would you want to set your u equal to? I'll let you think about that because if you can figure out this part, then the rest will just boil down to a fairly straightforward integral. You want to set u to be equal to the expression that you have its derivative laying around. So we could set u equal to x to the fourth plus 7. Now what is du going to be equal to?