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D( x )
3*x^2-(5*x)-2 = 0
3*x^2-(5*x)-2 = 0
3*x^2-(5*x)-2 = 0
3*x^2-5*x-2 = 0
3*x^2-5*x-2 = 0
DELTA = (-5)^2-(-2*3*4)
DELTA = 49
DELTA > 0
x = (49^(1/2)+5)/(2*3) or x = (5-49^(1/2))/(2*3)
x = 2 or x = -1/3
x in (-oo:-1/3) U (-1/3:2) U (2:+oo)
(18*x^2-2)/(3*x^2-(5*x)-2) = 0
(18*x^2-2)/(3*x^2-5*x-2) = 0
3*x^2-5*x-2 = 0
3*x^2-5*x-2 = 0
DELTA = (-5)^2-(-2*3*4)
DELTA = 49
DELTA > 0
x = (49^(1/2)+5)/(2*3) or x = (5-49^(1/2))/(2*3)
x = 2 or x = -1/3
(x+1/3)*(x-2) = 0
(18*x^2-2)/((x+1/3)*(x-2)) = 0
18*x^2 = 2 // : 18
x^2 = 1/9
x^2 = 1/9 // ^ 1/2
abs(x) = 1/3
x = 1/3 or x = -1/3
x in { -1/3}
x = 1/3
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