Give a proof by cases that shows that n(n2−1)(n+2) is a multiple of 4, for all integers n
I have already done case 1 where n is even. I am doing case 2 where n is odd and I'm a bit confuse how to finish off the problem..Uploaded a picture of my work..
Is this work sufficient enough to prove that it is a multiple of 4? The 6k would not have any affect of the result in general?
I feel it is wrong because of the 6k. Right now my thoughts are if (statement) is a multiple of 4, then (statement) is a multiple of 2 as well. And work from there.
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