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D( n )
240000-(300*n^2) = 0
240000-(300*n^2) = 0
240000-(300*n^2) = 0
240000-300*n^2 = 0
-300*n^2 = -240000 // : -300
n^2 = 800
n^2 = 800 // ^ 1/2
abs(n) = 20*2^(1/2)
n = 20*2^(1/2) or n = -(20*2^(1/2))
n in (-oo:-(20*2^(1/2))) U (-(20*2^(1/2)):20*2^(1/2)) U (20*2^(1/2):+oo)
(300*n^2)/(240000-(300*n^2)) = 0
(300*n^2)/(240000-300*n^2) = 0
300*n^2 = 0 // : 300
n^2 = 0
n = 0
n = 0
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