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D( x )
2*x+1.41 = 0
2*x+1.41 = 0
2*x+1.41 = 0
2*x+1.41 = 0 // - 1.41
2*x = -1.41 // : 2
x = -1.41/2
x = -0.705
x in (-oo:-0.705) U (-0.705:+oo)
2*x+1.41 = (2-(2*x)-1.41)/(2*x+1.41) // - (2-(2*x)-1.41)/(2*x+1.41)
2*x-((2-(2*x)-1.41)/(2*x+1.41))+1.41 = 0
2*x-((2-2*x-1.41)/(2*x+1.41))+1.41 = 0
(-1*(0.59-2*x))/(2*x+1.41)+2*x+1.41 = 0
(-1*(0.59-2*x))/(2*x+1.41)+(2*x*(2*x+1.41))/(2*x+1.41)+(1.41*(2*x+1.41))/(2*x+1.41) = 0
2*x*(2*x+1.41)-1*(0.59-2*x)+1.41*(2*x+1.41) = 0
4*x^2+4.82*x+2.82*x-0.59+1.9881 = 0
4*x^2+7.64*x+1.3981 = 0
4*x^2+7.64*x+1.3981 = 0
4*x^2+7.64*x+1.3981 = 0
DELTA = 7.64^2-(1.3981*4*4)
DELTA = 7.64^2-22.3696
DELTA = 36
DELTA > 0
x = ((7.64^2-22.3696)^(1/2)-7.64)/(2*4) or x = (-(7.64^2-22.3696)^(1/2)-7.64)/(2*4)
x = -0.205 or x = -1.705
(x+1.705)*(x+0.205) = 0
((x+1.705)*(x+0.205))/(2*x+1.41) = 0
((x+1.705)*(x+0.205))/(2*x+1.41) = 0 // * 2*x+1.41
(x+1.705)*(x+0.205) = 0
( x+0.205 )
x+0.205 = 0 // - 0.205
x = -0.205
( x+1.705 )
x+1.705 = 0 // - 1.705
x = -1.705
x in { -0.205, -1.705 }
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