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D( x )
(2*x^3+9*x)^2 = 0
(2*x^3+9*x)^2 = 0
(2*x^3+9*x)^2 = 0
2*x^3+9*x = 0
x*(2*x^2+9) = 0
2*x^2 = -9 // : 2
x^2 = -9/2
x = 0
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
((4*x^2-7)^3)/((2*x^3+9*x)^2) = 0
2*x^3+9*x = 0
x*(2*x^2+9) = 0
2*x^2 = -9 // : 2
x^2 = -9/2
x = 0
((4*x^2-7)^3)/(x^2) = 0
4*x^2 = 7 // : 4
x^2 = 7/4
x^2 = 7/4 // ^ 1/2
abs(x) = (7/4)^(1/2)
x = (7/4)^(1/2) or x = -(7/4)^(1/2)
x in { (7/4)^(1/2), -(7/4)^(1/2), (7/4)^(1/2), -(7/4)^(1/2), (7/4)^(1/2), -(7/4)^(1/2) }
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