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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(1/5)*x-(3/x)+3+15 = 5 // - 5
(1/5)*x-(3/x)-5+3+15 = 0
(1/5)*x-3*x^-1-5+3+15 = 0
1/5*x^1-3*x^-1+13*x^0 = 0
(1/5*x^2+13*x^1-3*x^0)/(x^1) = 0 // * x^2
x^1*(1/5*x^2+13*x^1-3*x^0) = 0
x^1
(1/5)*x^2+13*x-3 = 0
(1/5)*x^2+13*x-3 = 0
DELTA = 13^2-(-3*4*(1/5))
DELTA = 857/5
DELTA > 0
x = ((857/5)^(1/2)-13)/(2*(1/5)) or x = (-(857/5)^(1/2)-13)/(2*(1/5))
x = 5/2*((857/5)^(1/2)-13) or x = -5/2*((857/5)^(1/2)+13)
x in { -5/2*((857/5)^(1/2)+13), 5/2*((857/5)^(1/2)-13)}
x in { -5/2*((857/5)^(1/2)+13), 5/2*((857/5)^(1/2)-13) }
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