Final answer:
The expression (b - c)^2 - 10(b - c) can be factored completely as (b - c)(b - c - 10).
Step-by-step explanation:
The expression (b - c)^2 - 10(b - c) can be factored completely as follows:
(b - c)^2 - 10(b - c) = (b - c)(b - c) - 10(b - c)
Using the distributive property, we get:
(b - c)(b - c - 10)
Therefore, option B) (b - c)(b - c - 10) is the completely factored form of the expression.