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D( x )
3*x^2-(29*x)+56 = 0
3*x^2-(29*x)+56 = 0
3*x^2-(29*x)+56 = 0
3*x^2-29*x+56 = 0
3*x^2-29*x+56 = 0
DELTA = (-29)^2-(3*4*56)
DELTA = 169
DELTA > 0
x = (169^(1/2)+29)/(2*3) or x = (29-169^(1/2))/(2*3)
x = 7 or x = 8/3
x in (-oo:8/3) U (8/3:7) U (7:+oo)
(3*x^3-(13*x^2)-(56*x))/(3*x^2-(29*x)+56) = 0
(3*x^3-13*x^2-56*x)/(3*x^2-29*x+56) = 0
3*x^3-13*x^2-56*x = 0
x*(3*x^2-13*x-56) = 0
3*x^2-13*x-56 = 0
DELTA = (-13)^2-(-56*3*4)
DELTA = 841
DELTA > 0
x = (841^(1/2)+13)/(2*3) or x = (13-841^(1/2))/(2*3)
x = 7 or x = -8/3
x*(x+8/3)*(x-7) = 0
3*x^2-29*x+56 = 0
3*x^2-29*x+56 = 0
DELTA = (-29)^2-(3*4*56)
DELTA = 169
DELTA > 0
x = (169^(1/2)+29)/(2*3) or x = (29-169^(1/2))/(2*3)
x = 7 or x = 8/3
(x-8/3)*(x-7) = 0
(x*(x+8/3)*(x-7))/((x-8/3)*(x-7)) = 0
( x+8/3 )
x+8/3 = 0 // - 8/3
x = -8/3
( x-7 )
x-7 = 0 // + 7
x = 7
( x )
x = 0
x in { 7}
x in { -8/3, 0 }
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