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D( x )
x^2 = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
(5*x)/(x^2)-(10*x) = 0
(5*x)/(x^2)-10*x = 0
5*x^-1-10*x^1 = 0
(5*x^0-10*x^2)/(x^1) = 0 // * x^2
x^1*(5*x^0-10*x^2) = 0
x^1
5-10*x^2 = 0
5-10*x^2 = 0
DELTA = 0^2-(-10*4*5)
DELTA = 200
DELTA > 0
x = (200^(1/2)+0)/(-10*2) or x = (0-200^(1/2))/(-10*2)
x = (-2^(1/2))/2 or x = (2^(1/2))/2
x in { (-2^(1/2))/2, (2^(1/2))/2}
x in { (-2^(1/2))/2, (2^(1/2))/2 }
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