Final answer:
There are no nonpermissible replacements for b in the given expression.
Step-by-step explanation:
To find the nonpermissible replacement for b in the expression b^2 + 5b + 5, we need to determine any values of b that would make the expression undefined. In this case, the expression does not involve any division or square roots, so there are no nonpermissible replacements for b. We can substitute any value for b and the expression will still be defined.