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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(1-(6*x^2))/x = 9 // - 9
(1-(6*x^2))/x-9 = 0
(1-6*x^2)/x-9 = 0
(1-6*x^2)/x+(-9*x)/x = 0
1-6*x^2-9*x = 0
1-6*x^2-9*x = 0
1-6*x^2-9*x = 0
DELTA = (-9)^2-(-6*1*4)
DELTA = 105
DELTA > 0
x = (105^(1/2)+9)/(-6*2) or x = (9-105^(1/2))/(-6*2)
x = (105^(1/2)+9)/(-12) or x = (9-105^(1/2))/(-12)
(x-((105^(1/2)+9)/(-12)))*(x-((9-105^(1/2))/(-12))) = 0
((x-((105^(1/2)+9)/(-12)))*(x-((9-105^(1/2))/(-12))))/x = 0
((x-((105^(1/2)+9)/(-12)))*(x-((9-105^(1/2))/(-12))))/x = 0 // * x
(x-((105^(1/2)+9)/(-12)))*(x-((9-105^(1/2))/(-12))) = 0
( x-((105^(1/2)+9)/(-12)) )
x-((105^(1/2)+9)/(-12)) = 0 // + (105^(1/2)+9)/(-12)
x = (105^(1/2)+9)/(-12)
( x-((9-105^(1/2))/(-12)) )
x-((9-105^(1/2))/(-12)) = 0 // + (9-105^(1/2))/(-12)
x = (9-105^(1/2))/(-12)
x in { (105^(1/2)+9)/(-12), (9-105^(1/2))/(-12) }
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