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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
25*x-(48/x)-2 = 0
25*x-48*x^-1-2 = 0
25*x^1-48*x^-1-2*x^0 = 0
(25*x^2-2*x^1-48*x^0)/(x^1) = 0 // * x^2
x^1*(25*x^2-2*x^1-48*x^0) = 0
x^1
25*x^2-2*x-48 = 0
25*x^2-2*x-48 = 0
DELTA = (-2)^2-(-48*4*25)
DELTA = 4804
DELTA > 0
x = (4804^(1/2)+2)/(2*25) or x = (2-4804^(1/2))/(2*25)
x = (2*1201^(1/2)+2)/50 or x = (2-2*1201^(1/2))/50
x in { (2-2*1201^(1/2))/50, (2*1201^(1/2)+2)/50}
x in { (2-2*1201^(1/2))/50, (2*1201^(1/2)+2)/50 }
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