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D( x )
0.15-x = 0
0.15-x = 0
0.15-x = 0
0.15-x = 0 // - 0.15
-x = -0.15 // * -1
x = 0.15
x in (-oo:0.15) U (0.15:+oo)
4.5 = ((2*x)^2)/(0.15-x) // - ((2*x)^2)/(0.15-x)
4.5-(((2*x)^2)/(0.15-x)) = 0
(-1*4*x^2)/(0.15-x)+4.5 = 0
(-1*4*x^2)/(0.15-x)+(4.5*(0.15-x))/(0.15-x) = 0
4.5*(0.15-x)-1*4*x^2 = 0
0.675-4*x^2-4.5*x = 0
0.675-4*x^2-4.5*x = 0
0.675-4*x^2-4.5*x = 0
DELTA = (-4.5)^2-(-4*0.675*4)
DELTA = 4.5^2+10.8
DELTA = 31.05
DELTA > 0
x = ((4.5^2+10.8)^(1/2)+4.5)/(-4*2) or x = (4.5-(4.5^2+10.8)^(1/2))/(-4*2)
x = ((4.5^2+10.8)^(1/2)+4.5)/(-8) or x = (4.5-(4.5^2+10.8)^(1/2))/(-8)
(x-(((4.5^2+10.8)^(1/2)+4.5)/(-8)))*(x-((4.5-(4.5^2+10.8)^(1/2))/(-8))) = 0
((x-(((4.5^2+10.8)^(1/2)+4.5)/(-8)))*(x-((4.5-(4.5^2+10.8)^(1/2))/(-8))))/(0.15-x) = 0
((x-(((4.5^2+10.8)^(1/2)+4.5)/(-8)))*(x-((4.5-(4.5^2+10.8)^(1/2))/(-8))))/(0.15-x) = 0 // * 0.15-x
(x-(((4.5^2+10.8)^(1/2)+4.5)/(-8)))*(x-((4.5-(4.5^2+10.8)^(1/2))/(-8))) = 0
( x-(((4.5^2+10.8)^(1/2)+4.5)/(-8)) )
x-(((4.5^2+10.8)^(1/2)+4.5)/(-8)) = 0 // + ((4.5^2+10.8)^(1/2)+4.5)/(-8)
x = ((4.5^2+10.8)^(1/2)+4.5)/(-8)
( x-((4.5-(4.5^2+10.8)^(1/2))/(-8)) )
x-((4.5-(4.5^2+10.8)^(1/2))/(-8)) = 0 // + (4.5-(4.5^2+10.8)^(1/2))/(-8)
x = (4.5-(4.5^2+10.8)^(1/2))/(-8)
x in { ((4.5^2+10.8)^(1/2)+4.5)/(-8), (4.5-(4.5^2+10.8)^(1/2))/(-8) }
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