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this is the answer I got.. 

Hev123  Mar 5, 2018
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3+0 Answers

 #1
avatar+7048 
+3

\(\frac{f}{r^2}+a=n+k\\ \frac{f}{r^2}=n+k-a\\ f=r^2(n+k-a)\\ \frac{f}{n+k-a}=r^2\\ r=\pm\sqrt{\frac{f}{n+k-a}}\)

 

Your answer is correct!

hectictar  Mar 5, 2018
 #2
avatar+12266 
0

Are a bunch of posters here on the same home-schooling program?  Because I am seeing a LOT of multiple posts of the EXACT same questions from DIFFERENT posters for the last few days....and they are posted with the EXACT same fonts !

Hmmmmm......

cheeky

ElectricPavlov  Mar 5, 2018
 #3
avatar+258 
0

I don't know.. but I am checking my answers so Ill know that I am working my problems correctly. 

Hev123  Mar 5, 2018

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