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Competition - post a photo you've taken of nature >>

Can someone tell me where I went wrong?

On the attached image.
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TeeEm
19
Original post by EricPiphany
On the attached image.


post the question and hopefully someone will help you
Original post by TeeEm
post the question and hopefully someone will help you


I've taken the second derivative of the first line, then substituted x = -1. For odd n, the left side is an integer and the right side is a fraction.
Reply 3
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TeeEm
19
Original post by EricPiphany
I've taken the second derivative of the first line, then substituted x = -1. For odd n, the left side is an integer and the right side is a fraction.


hopefully one of the big guns will soon arrive
The mistake is your factorisation on the second line after subbing in x=-1.

You can't factorise (-1)n out of the entire numerator because of the +2 at the end.
Reply 5
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TeeEm
19
Original post by justinawe
The mistake is your factorisation on the second line after subbing in x=-1.

You can't factorise (-1)n out of the entire numerator because of the +2 at the end.


An American comes to the rescue ...
Original post by justinawe
The mistake is your factorisation on the second line after subbing in x=-1.

You can't factorise (-1)n out of the entire numerator because of the +2 at the end.


Thanks a lot for that :smile:
I was much too eager to factorise that (−1)n(-1)^n out...

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