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smallsorrow
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PostPosted: Sat Oct 11, 2008 9:14 am    Post subject: numper property from og Reply with quote
If xy+z=x(y+z), which of the following must be true:

A)x=0; Z=0
B)x=1; y=1
C)y=1;z=0
D)x=1; z=0
E)x=1;z=1

OA follows
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cramya
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PostPosted: Sat Oct 11, 2008 9:27 am    Post subject: Reply with quote
xy+z=x(y+z)

xy+z = xy+xz

So z = xz
z-xz= 0
z(1-x) = 0

Either z-0 or 1-x = 0
z=0 x= 1

D)
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