How to probably insert proof by induction in wolframalpha

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I'm trying to get this into wolframalpha.com by doing the "prove by induction" command to check my results.

However I'm not sure how to insert it.

See attached picture

Result in Wolfram

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Writing

prove by induction sum of (-1)^i(2i +1) for i from 0 to n equals (-1)^n (n+1) for n > 0

seems to be good enough.

And by the way, your proof seems about right!