Answer:
b ≠ - 1
Explanation:
The denominator of the rational expression cannot be zero as this would make it undefined.
Equating the denominator to zero and solving gives the value that b cannot be.
solve
5b + 5 = 0 ( subtract 5 from both sides )
5b = - 5 ( divide both sides by 5 )
b = - 1 ← excluded value