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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x*(((0.4-(2*x))^2)/x) = 49.5 // - 49.5
x*(((0.4-(2*x))^2)/x)-49.5 = 0
x*(((0.4-2*x)^2)/x)-49.5 = 0
(x*(0.4-2*x)^2)/x-49.5 = 0
(x*(0.4-2*x)^2)/x+(-49.5*x)/x = 0
x*(0.4-2*x)^2-49.5*x = 0
4*x^3-1.6*x^2-49.34*x = 0
4*x^3-1.6*x^2-49.34*x = 0
x*(4*x^2-1.6*x-49.34) = 0
4*x^2-1.6*x-49.34 = 0
DELTA = (-1.6)^2-(-49.34*4*4)
DELTA = 1.6^2+789.44
DELTA = 792
DELTA > 0
x = ((1.6^2+789.44)^(1/2)+1.6)/(2*4) or x = (1.6-(1.6^2+789.44)^(1/2))/(2*4)
x = ((1.6^2+789.44)^(1/2)+1.6)/8 or x = (1.6-(1.6^2+789.44)^(1/2))/8
x*(x-((1.6-(1.6^2+789.44)^(1/2))/8))*(x-(((1.6^2+789.44)^(1/2)+1.6)/8)) = 0
(x*(x-((1.6-(1.6^2+789.44)^(1/2))/8))*(x-(((1.6^2+789.44)^(1/2)+1.6)/8)))/x = 0
(x*(x-((1.6-(1.6^2+789.44)^(1/2))/8))*(x-(((1.6^2+789.44)^(1/2)+1.6)/8)))/x = 0 // * x
x*(x-((1.6-(1.6^2+789.44)^(1/2))/8))*(x-(((1.6^2+789.44)^(1/2)+1.6)/8)) = 0
( x-(((1.6^2+789.44)^(1/2)+1.6)/8) )
x-(((1.6^2+789.44)^(1/2)+1.6)/8) = 0 // + ((1.6^2+789.44)^(1/2)+1.6)/8
x = ((1.6^2+789.44)^(1/2)+1.6)/8
( x-((1.6-(1.6^2+789.44)^(1/2))/8) )
x-((1.6-(1.6^2+789.44)^(1/2))/8) = 0 // + (1.6-(1.6^2+789.44)^(1/2))/8
x = (1.6-(1.6^2+789.44)^(1/2))/8
( x )
x = 0
x in { 0}
x in { ((1.6^2+789.44)^(1/2)+1.6)/8, (1.6-(1.6^2+789.44)^(1/2))/8 }
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