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D( x )
9*x^2 = 0
9*x^2 = 0
9*x^2 = 0
9*x^2 = 0 // : 9
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
(27*x^5+9*x^4-(18*x^3))/(9*x^2) = 0
(27*x^5+9*x^4-18*x^3)/(9*x^2) = 0
27*x^5+9*x^4-18*x^3 = 0
9*x^3*(3*x^2+x-2) = 0
3*x^2+x-2 = 0
DELTA = 1^2-(-2*3*4)
DELTA = 25
DELTA > 0
x = (25^(1/2)-1)/(2*3) or x = (-25^(1/2)-1)/(2*3)
x = 2/3 or x = -1
9*x^3*(x+1)*(x-2/3) = 0
(9*x^3*(x+1)*(x-2/3))/(9*x^2) = 0
( 9*x^3 )
9*x^3 = 0 // : 9
x^3 = 0
x = 0
( x+1 )
x+1 = 0 // - 1
x = -1
( x-2/3 )
x-2/3 = 0 // + 2/3
x = 2/3
x in { 0}
x in { -1, 2/3 }
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