SOLUTION :
M = f^2 N / (n + N)^2
=> M(n + N)^2 = f^2 N
=> (n + N)^2 M = f^2 N
Comparing both sides :
(n + N)^2 = f^2. And N = M
=> n + N = f. And N = M
=> N = f - n and N = M. (ANSWER).
M= f^2 N divided by (n+N)^2 Solve for N. all variables represent all real numbers
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