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D( x )
0.06-x = 0
0.06-x = 0
0.06-x = 0
0.06-x = 0 // - 0.06
-x = -0.06 // * -1
x = 0.06
x in (-oo:0.06) U (0.06:+oo)
1.8 = (x^2)/(0.06-x) // - (x^2)/(0.06-x)
1.8-((x^2)/(0.06-x)) = 0
(-1*x^2)/(0.06-x)+1.8 = 0
(-1*x^2)/(0.06-x)+(1.8*(0.06-x))/(0.06-x) = 0
1.8*(0.06-x)-1*x^2 = 0
0.108-x^2-1.8*x = 0
0.108-x^2-1.8*x = 0
0.108-x^2-1.8*x = 0
DELTA = (-1.8)^2-(-1*0.108*4)
DELTA = 1.8^2+0.432
DELTA = 3.672
DELTA > 0
x = ((1.8^2+0.432)^(1/2)+1.8)/(-1*2) or x = (1.8-(1.8^2+0.432)^(1/2))/(-1*2)
x = ((1.8^2+0.432)^(1/2)+1.8)/(-2) or x = (1.8-(1.8^2+0.432)^(1/2))/(-2)
(x-(((1.8^2+0.432)^(1/2)+1.8)/(-2)))*(x-((1.8-(1.8^2+0.432)^(1/2))/(-2))) = 0
((x-(((1.8^2+0.432)^(1/2)+1.8)/(-2)))*(x-((1.8-(1.8^2+0.432)^(1/2))/(-2))))/(0.06-x) = 0
((x-(((1.8^2+0.432)^(1/2)+1.8)/(-2)))*(x-((1.8-(1.8^2+0.432)^(1/2))/(-2))))/(0.06-x) = 0 // * 0.06-x
(x-(((1.8^2+0.432)^(1/2)+1.8)/(-2)))*(x-((1.8-(1.8^2+0.432)^(1/2))/(-2))) = 0
( x-(((1.8^2+0.432)^(1/2)+1.8)/(-2)) )
x-(((1.8^2+0.432)^(1/2)+1.8)/(-2)) = 0 // + ((1.8^2+0.432)^(1/2)+1.8)/(-2)
x = ((1.8^2+0.432)^(1/2)+1.8)/(-2)
( x-((1.8-(1.8^2+0.432)^(1/2))/(-2)) )
x-((1.8-(1.8^2+0.432)^(1/2))/(-2)) = 0 // + (1.8-(1.8^2+0.432)^(1/2))/(-2)
x = (1.8-(1.8^2+0.432)^(1/2))/(-2)
x in { ((1.8^2+0.432)^(1/2)+1.8)/(-2), (1.8-(1.8^2+0.432)^(1/2))/(-2) }
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