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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
19/x-(30*(10*x+2)) = 25*(3*x+205) // - 25*(3*x+205)
19/x-(30*(10*x+2))-(25*(3*x+205)) = 0
19/x-30*(10*x+2)-25*(3*x+205) = 0
(-30*x*(10*x+2))/x+(-25*x*(3*x+205))/x+19/x = 0
19-30*x*(10*x+2)-25*x*(3*x+205) = 0
19-375*x^2-5185*x = 0
19-375*x^2-5185*x = 0
19-375*x^2-5185*x = 0
DELTA = (-5185)^2-(-375*4*19)
DELTA = 26912725
DELTA > 0
x = (26912725^(1/2)+5185)/(-375*2) or x = (5185-26912725^(1/2))/(-375*2)
x = (5*1076509^(1/2)+5185)/(-750) or x = (5185-5*1076509^(1/2))/(-750)
(x-((5*1076509^(1/2)+5185)/(-750)))*(x-((5185-5*1076509^(1/2))/(-750))) = 0
((x-((5*1076509^(1/2)+5185)/(-750)))*(x-((5185-5*1076509^(1/2))/(-750))))/x = 0
((x-((5*1076509^(1/2)+5185)/(-750)))*(x-((5185-5*1076509^(1/2))/(-750))))/x = 0 // * x
(x-((5*1076509^(1/2)+5185)/(-750)))*(x-((5185-5*1076509^(1/2))/(-750))) = 0
( x-((5*1076509^(1/2)+5185)/(-750)) )
x-((5*1076509^(1/2)+5185)/(-750)) = 0 // + (5*1076509^(1/2)+5185)/(-750)
x = (5*1076509^(1/2)+5185)/(-750)
( x-((5185-5*1076509^(1/2))/(-750)) )
x-((5185-5*1076509^(1/2))/(-750)) = 0 // + (5185-5*1076509^(1/2))/(-750)
x = (5185-5*1076509^(1/2))/(-750)
x in { (5*1076509^(1/2)+5185)/(-750), (5185-5*1076509^(1/2))/(-750) }
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