K kiddopop New member Joined Sep 14, 2009 Messages 25 Sep 14, 2009 #1 The problem is: Prove using the contrapositive approach: If x is positive tthen so is x + 1. I just don't know how or where to start.
The problem is: Prove using the contrapositive approach: If x is positive tthen so is x + 1. I just don't know how or where to start.
P PAULK Junior Member Joined Dec 13, 2007 Messages 124 Sep 14, 2009 #2 kiddopop said: The problem is: Prove using the contrapositive approach: If x is positive tthen so is x + 1. I just don't know how or where to start. Click to expand... You start by assuming the conclusion is false, as in: IT IS FALSE THAT x + 1 is positive. Draw some conclusion that contradicts a known fact. Write NOT( x + 1 > 0), or x + 1 <= 0 Can you take it from there?
kiddopop said: The problem is: Prove using the contrapositive approach: If x is positive tthen so is x + 1. I just don't know how or where to start. Click to expand... You start by assuming the conclusion is false, as in: IT IS FALSE THAT x + 1 is positive. Draw some conclusion that contradicts a known fact. Write NOT( x + 1 > 0), or x + 1 <= 0 Can you take it from there?
