Find the inverse of the function f(x)=x౩+1

Is this f(x)=x³+1 or f(x)=3x+1?

Edit: Okay, well f(x)=x³+1 is basically the same as saying y=x³+1.  To find the inverse, you would need to take the cube root of x so its y=∛(x-1).

I am pretty sure this is correct but this is one of the more confusing ones.  This is the best answer I could get

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