if xy+z=x(y+z) which of the following must be true?	Choose the correct choice from the following options.
A) x=2 or z=0
B) x=1 or z=0
C) x=1 or z=1
D) x=0 or z=0
E) x=0 or z=0
xy+z=xy+xz   z=xz   xz-z=0   z(x-1)=0   Means;   either z=0   OR   x-1=0 i.e. x=1   Answer x=1 or z=0
<result>B</result>
if xy+z=x(y+z) which of the following must be true?