Solve for r.

 Mar 4, 2018

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

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


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


f/(n+k-a)  = r^2             take sqrt of both sides


+- ( f/(n+k-a) ) = r

 Mar 4, 2018

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