July 12th, 2019, 03:53 PM  #11 
Senior Member Joined: Jun 2019 From: USA Posts: 376 Thanks: 202 
Microsoft Word (equation editor) In the image you originally posted, you had x times f', x^2 times f'', etc.. These would all have the same units as f. The integral should have units of f times units of x, as do all the terms in what I posted. 
July 13th, 2019, 01:38 AM  #12 
Newbie Joined: Jul 2019 From: Jordan Posts: 11 Thanks: 0 
yes now I noticed that I wrote it wrong from the first. it's my bad and I'm sorry for that. I am a nurse and I didn't study math before . math is my hobby. thanks a lot for your time and this thread was very useful for me . 
July 13th, 2019, 02:02 PM  #13 
Senior Member Joined: Jun 2019 From: USA Posts: 376 Thanks: 202 
You are quite welcome.


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