Put simply, the inverse of y=x^5+x^4+x is x=y^5+y^4+y. Unfortunately, this is a quintic function and there is no quintic formula.
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the inverse of x+3
x=y is the identity. It is its own inverse. So the inverse is y=x.
sqrt(x4) = x4/2 = x2
N = x4 x8 = x4+4 = (x4)2 = N2
x to the fourth (x4)