# help !. Switching- algebra theorem

Discussion in 'Homework Help' started by wajeh, Oct 22, 2011.

1. ### wajeh Thread Starter New Member

Oct 22, 2011
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(x+y).(x'+z).(y+z)=(x+y).(x'+z)
how can we prove this theorem. I'll be thankful if u could help me out!

2. ### Georacer Moderator

Nov 25, 2009
5,151
1,266
Why don't you make all of the multiplications and come up with a sum of products on both sides. Then you will be able to compare the terms on both sides.

3. ### tgotwalt1158 Member

Feb 28, 2011
111
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Try to divide both sides by a term which is common on both sides. This will give uncommon term equal to 1, hence the equation will be proved to be true.

4. ### Georacer Moderator

Nov 25, 2009
5,151
1,266
I 'm pretty sure that this method isn't valid in Boolean algebra. Can you post a source that says otherwise?

5. ### tgotwalt1158 Member

Feb 28, 2011
111
18
Sorry I had a glance on equation only did not see the title, was a bit in hurry and thought it as a regular algebraic equation. Could I attempt direct solution in boolean here or only the hint is allowed in home work help. Plz explain!

6. ### Georacer Moderator

Nov 25, 2009
5,151
1,266
So far the OP hasn't posted any work. I wouldn't recommend posting a solution so early, he hasn't done anything to earn it.

Post a hint if you want, but wait a week or so before posting the whole solution. I 'd hate to see the question unanswered

tgotwalt1158 likes this.