Answer:
b = 8 and b = 8
Explanation:
f(b) =b² − 16b + 64 is set equal to zero and solved for b:
f(b) =b² − 16b + 64 = 0
This quadratic can be factored, as follows: f(b) = (b - 8)(b - 8) = (b - 8)² = 0
There are two real, equal zeros: b = 8 and b = 8.