SOLUTION: If z is a whole number, explain why the value of the expression z(z+1) is always even

Question 862313: If z is a whole number, explain why the value of the expression z(z+1) is always even
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
If is odd, then
is even, and
is odd x even
--------------------------
If is even, then
is odd, and
is even x odd
---------------------------
In both cases, you have an even
number with an odd multiplier
which has to be even

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