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D( x )
-4*x^2-(12*x)-8 = 0
-4*x^2-(12*x)-8 = 0
-4*x^2-(12*x)-8 = 0
-4*x^2-12*x-8 = 0
-4*x^2-12*x-8 = 0
DELTA = (-12)^2-(-8*(-4)*4)
DELTA = 16
DELTA > 0
x = (16^(1/2)+12)/(-4*2) or x = (12-16^(1/2))/(-4*2)
x = -2 or x = -1
x in (-oo:-2) U (-2:-1) U (-1:+oo)
(x^3-(3*x^2)-(4*x))/(-4*x^2-(12*x)-8) = 0
(x^3-3*x^2-4*x)/(-4*x^2-12*x-8) = 0
x^3-3*x^2-4*x = 0
x*(x^2-3*x-4) = 0
x^2-3*x-4 = 0
DELTA = (-3)^2-(-4*1*4)
DELTA = 25
DELTA > 0
x = (25^(1/2)+3)/(1*2) or x = (3-25^(1/2))/(1*2)
x = 4 or x = -1
x*(x+1)*(x-4) = 0
-4*x^2-12*x-8 = 0
-4*(x^2+3*x+2) = 0
x^2+3*x+2 = 0
DELTA = 3^2-(1*2*4)
DELTA = 1
DELTA > 0
x = (1^(1/2)-3)/(1*2) or x = (-1^(1/2)-3)/(1*2)
x = -1 or x = -2
-4*(x+2)*(x+1) = 0
(x*(x+1)*(x-4))/(-4*(x+2)*(x+1)) = 0
( x+1 )
x+1 = 0 // - 1
x = -1
( x-4 )
x-4 = 0 // + 4
x = 4
( x )
x = 0
x in { -1}
x in { 4, 0 }
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