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D( x )
6*x-(30*x^2) = 0
6*x-(30*x^2) = 0
6*x-(30*x^2) = 0
6*x-30*x^2 = 0
6*x-30*x^2 = 0
DELTA = 6^2-(-30*0*4)
DELTA = 36
DELTA > 0
x = (36^(1/2)-6)/(-30*2) or x = (-36^(1/2)-6)/(-30*2)
x = 0 or x = 1/5
x in (-oo:0) U (0:1/5) U (1/5:+oo)
(x-16)/(6*x-(30*x^2)) = 0
(x-16)/(6*x-30*x^2) = 0
6*x-30*x^2 = 0
6*x*(1-5*x) = 0
1-5*x = 0 // - 1
-5*x = -1 // : -5
x = -1/(-5)
x = 1/5
6*x*(x-1/5) = 0
(x-16)/(6*x*(x-1/5)) = 0
x-16 = 0 // + 16
x = 16
x = 16
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