# Boolean Algebra Help

Discussion in 'Homework Help' started by cat, Sep 25, 2006.

Not open for further replies.
1. ### cat Thread Starter New Member

Sep 25, 2006
8
0
Hi guys,

I have a question that i can't find the answer to:

There's a given function: F=x+yz
Then i have to show that F+F'=1
I found that F'=x'y'+x'z'

therefore:

F+F'=x+yz+x'y'+x'z'
=yz+(xx')(xz')+x'y'
=yz+x'y'

i don't know how to go from here
Have i done something wrong.
cat

2. ### oldbird New Member

Sep 24, 2006
3
0
F+F'=x+yz+x'y'+x'z'
=x+yz+x'(y'+z')
=x+yz+x'(yz)'
=(x'(yz)')'+x'(yz)'
=1

3. ### Søren Senior Member

Sep 2, 2006
472
28
Hi,

Oh Gee, aren't school teachers dull, dumb and delusional

Whatever the (Boolean) function is, F + /F will allways yeild "1" as it's an OR of something and its opposite - That's basic Boolean !

4. ### cat Thread Starter New Member

Sep 25, 2006
8
0
thanks sooooo much oldbird

hay soren, what you are saying is right but you know, poor students like us have to do the homeowrk that they give. otherwise we are screwed
thanks for the comment anyways
cat

5. ### mik3ca Active Member

Feb 11, 2007
189
0
LMAO

Have the teacher refer to the "OR" gate truth table, because in an OR gate, an input, along with the same input inverted equals 1.

6. ### Papabravo Expert

Feb 24, 2006
10,140
1,789
Except that you missed the point of the exercise. If you're too ignorant to figure it out, then I'm cetainly not going to enlighten you.

7. ### Papabravo Expert

Feb 24, 2006
10,140
1,789
Two clowns in one day missed the point of the exercise. What's a poor student to do when faced with such boorishness.

8. ### Dave Retired Moderator

Nov 17, 2003
6,960
144
This is an old thread, please do not resurrect an old thread unless you are going to contribute something to the answer that may be of benefit to others.

Do not refer to other members as "clowns" - you are free to make a point but please do it with some propriety.

This topic will now be closed and only reopened at the OPs request.

Dave