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D( x )
10*x-x^2 < 0
(10*x-x^2)^0.5 = 0
10*x-x^2 < 0
10*x-x^2 < 0
10*x-x^2 < 0
DELTA = 10^2-(-1*0*4)
DELTA = 100
DELTA > 0
x = (100^(1/2)-10)/(-1*2) or x = (-100^(1/2)-10)/(-1*2)
x = 0 or x = 10
a = -1
a < 0
x in (-oo:0) U (10:+oo)
(10*x-x^2)^0.5 = 0
(10*x-x^2)^0.5 = 0
10*x-x^2 = 0
x*(10-x) = 0
10-x = 0 // - 10
-x = -10 // * -1
x = 10
x*(x-10) = 0
x^0.5*(x-10)^0.5 = 0
( x-10 )
x-10 = 0 // + 10
x = 10
( x )
x = 0
x in (0:10)
(5-x)/((10*x-x^2)^0.5) = 0
10*x-x^2 = 0
x*(10-x) = 0
10-x = 0 // - 10
-x = -10 // * -1
x = 10
x*(x-10) = 0
(5-x)/(x^0.5*(x-10)^0.5) = 0
5-x = 0 // - 5
-x = -5 // * -1
x = 5
x = 5
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