p*q = p+q-pq

1. determine whether * is commutative

2. determine whether * is associative.

Ok im not sure i understand the question. Do i just work out the answers from the right side of the equation or both sides?

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- Oct 22nd 2009, 12:08 PMdjmccabiecommutative, associative
p*q = p+q-pq

1. determine whether * is commutative

2. determine whether * is associative.

Ok im not sure i understand the question. Do i just work out the answers from the right side of the equation or both sides? - Oct 22nd 2009, 12:24 PMCaptainBlack
- Oct 22nd 2009, 12:30 PMdjmccabie
ahh, so i work out commutative and associative for p+q-pq ??

and did i post this in the wrong place? - Oct 22nd 2009, 12:40 PMCaptainBlack
- Oct 22nd 2009, 12:48 PMdjmccabie
ok so i would write -

1.

p+q-pq does not equal p-q+pq

therefore not commutative?

and then similarly to associative?

(p+q)-pq does not equal p-(q+pq)

your help is much appreciated - Oct 22nd 2009, 12:57 PMCaptainBlack
- Oct 22nd 2009, 01:00 PMCaptainBlack
- Oct 22nd 2009, 01:04 PMdjmccabie
thanks a lot i understand it now, did i do the associativity right?

- Oct 22nd 2009, 09:52 PMCaptainBlack