difficult problem solving question...

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If xy + z = x(y+z), which of the following must be true?

A] x = 0 and z = 0

B] x = 1 and y = 1

C] y = 1 and z = 0

D] x = 1 or y = 0

E] x = 1 or z = 0


I chose C but is the incorrect answer, kindly help me in this question...
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by sam2304 » Tue May 29, 2012 5:11 am
xy + z = x(y+z)
xy + z = xy + xz
z = xz
z(1-x) = 0

x = 1, z = 0

IMO E.
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by Anurag@Gurome » Tue May 29, 2012 6:06 am
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