+0  
 
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avatar+1015 

Solve for r.

fr2+a=n+k

AngelRay  Jun 6, 2018
 #1
avatar+86889 
+1

f/r^2 + a  = n + k        subtract "a" from both sides

 

f/r^2 =  n + k  - a         multiply both sides  by r^2

 

f  = r^2 ( n + k  -a )     divide  both sides by (n + k  -a)

 

f / ( n + k - a)  = r^2       take  both roots

 

±√ [ f / ( n + k -a) ]  =  r   ⇒  first  answer

 

 

 

cool cool cool

CPhill  Jun 6, 2018

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