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D( x )
0.1-x = 0
0.1-x = 0
0.1-x = 0
0.1-x = 0 // - 0.1
-x = -0.1 // * -1
x = 0.1
x in (-oo:0.1) U (0.1:+oo)
(x*x)/(0.1-x) = 1.8 // - 1.8
(x*x)/(0.1-x)-1.8 = 0
(x^2)/(0.1-x)-1.8 = 0
(x^2)/(0.1-x)+(-1.8*(0.1-x))/(0.1-x) = 0
x^2-1.8*(0.1-x) = 0
x^2+1.8*x-0.18 = 0
x^2+1.8*x-0.18 = 0
x^2+1.8*x-0.18 = 0
DELTA = 1.8^2-(-0.18*1*4)
DELTA = 1.8^2+0.72
DELTA = 3.96
DELTA > 0
x = ((1.8^2+0.72)^(1/2)-1.8)/(1*2) or x = (-(1.8^2+0.72)^(1/2)-1.8)/(1*2)
x = ((1.8^2+0.72)^(1/2)-1.8)/2 or x = (-((1.8^2+0.72)^(1/2)+1.8))/2
(x+((1.8^2+0.72)^(1/2)+1.8)/2)*(x-(((1.8^2+0.72)^(1/2)-1.8)/2)) = 0
((x+((1.8^2+0.72)^(1/2)+1.8)/2)*(x-(((1.8^2+0.72)^(1/2)-1.8)/2)))/(0.1-x) = 0
((x+((1.8^2+0.72)^(1/2)+1.8)/2)*(x-(((1.8^2+0.72)^(1/2)-1.8)/2)))/(0.1-x) = 0 // * 0.1-x
(x+((1.8^2+0.72)^(1/2)+1.8)/2)*(x-(((1.8^2+0.72)^(1/2)-1.8)/2)) = 0
( x+((1.8^2+0.72)^(1/2)+1.8)/2 )
x+((1.8^2+0.72)^(1/2)+1.8)/2 = 0 // - ((1.8^2+0.72)^(1/2)+1.8)/2
x = -(((1.8^2+0.72)^(1/2)+1.8)/2)
( x-(((1.8^2+0.72)^(1/2)-1.8)/2) )
x-(((1.8^2+0.72)^(1/2)-1.8)/2) = 0 // + ((1.8^2+0.72)^(1/2)-1.8)/2
x = ((1.8^2+0.72)^(1/2)-1.8)/2
x in { -(((1.8^2+0.72)^(1/2)+1.8)/2), ((1.8^2+0.72)^(1/2)-1.8)/2 }
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