yogi_Solution For x For A Case Where (x*(x+1))/2=10

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Yogi Anand, D.Eng, P.E.      ANAND Enterprises LLC -- Rochester Hills MI     Dec-17-2017

question by: Chris Dobbie

https://productforums.google.com/forum/?utm_medium=email&utm_source=best_answer_notification_button#!topic/docs/slBtOsC6CU8;context-place=forum/docs

Solving for x in sheets

I have a simple formula I'd like to solve in sheets.

(x*(x+1))/2=10

x=4

How can I write out this formula so the cell output is 4? 

Thanks for any help