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D( x )
2*x^2-18 = 0
2*x^2-18 = 0
2*x^2-18 = 0
2*x^2 = 18 // : 2
x^2 = 9
x^2 = 9 // ^ 1/2
abs(x) = 3
x = 3 or x = -3
x in (-oo:-3) U (-3:3) U (3:+oo)
((4*x)/3)*(2*x^2-18)^(-2/3) = 0
(4/3*x)/((2*x^2-18)^(2/3)) = 0
4/3*x = 0 // : 4/3
x = 0
x = 0
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