Problem: The expressions a+bc and (a+b)(a+c) are.
Answer Choices:
A. always equal
B. never equal
C. equal whenever a+b+c=1
D. equal when a+b+c=0
E. equal only when a=b=c=0
Solution:
For the equality a+bc=a2+ab+ac+bc to hold, we must have a=a2+ab+ac or 1=a+b+c.