Use algebraic manipulation to find the minimum product of-sums expression for the functionA + C + D) (A + B! + C)(A + B! + C! + D)

What am I doing wrong??

Here is what I have so far...

1) I need each expression to have all of the terms.
2) so I said okay the first term is missing a B, and the second term is missing a D so I did...

(A + B + C + D)(A + B! + C + D!)(A + B! + C + D)(A + B! + C + D!)(A + B! + C! + D)
=(A + C) (A + B! + C)(A + B! + D)(A + B! + C + D!)
=(A + C)(A + B! + C)(A + B! + C)
=(A + C)(A + B! + C)

is this correct?
please help! Been stuck on this problem for HOURS

 

Well, ask yourself if they agree for simple cases.

Q1) If A is HI, then the original expression is HI regardless of the state of any of the other inputs. Is this true of your result?

Q2) If A is LO but C is HI, then your result is HI regardless of the state of any of the other variables. Is this true of the original expression?

 

Oh, the following blog entry might be useful:

http://forum.allaboutcircuits.com/blog.php?b=583

 

Oh, the following blog entry might be useful:

http://forum.allaboutcircuits.com/blog.php?b=583

Awesome, thanks so much for the link! Finally someone who explains this information in HUMAN ENGLISH and not gibberish I can't read!

 

Awesome, thanks so much for the link! Finally someone who explains this information in HUMAN ENGLISH and not gibberish I can't read!

Thank you very much. I'm glad you found it helpful.