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D( x )
3*x^2-(11*x)-4 = 0
3*x^2-(11*x)-4 = 0
3*x^2-(11*x)-4 = 0
3*x^2-11*x-4 = 0
3*x^2-11*x-4 = 0
DELTA = (-11)^2-(-4*3*4)
DELTA = 169
DELTA > 0
x = (169^(1/2)+11)/(2*3) or x = (11-169^(1/2))/(2*3)
x = 4 or x = -1/3
x in (-oo:-1/3) U (-1/3:4) U (4:+oo)
(9*x^2-1)/(3*x^2-(11*x)-4) = 0
(9*x^2-1)/(3*x^2-11*x-4) = 0
3*x^2-11*x-4 = 0
3*x^2-11*x-4 = 0
DELTA = (-11)^2-(-4*3*4)
DELTA = 169
DELTA > 0
x = (169^(1/2)+11)/(2*3) or x = (11-169^(1/2))/(2*3)
x = 4 or x = -1/3
(x+1/3)*(x-4) = 0
(9*x^2-1)/((x+1/3)*(x-4)) = 0
9*x^2 = 1 // : 9
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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