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D( x )
x = 0
x^2 = 0
x = 0
x = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
3/x+5/(x^2) = 0
3*x^-1+5*x^-2 = 0
t_1 = x^-1
5*t_1^2+3*t_1^1 = 0
5*t_1^2+3*t_1 = 0
DELTA = 3^2-(0*4*5)
DELTA = 9
DELTA > 0
t_1 = (9^(1/2)-3)/(2*5) or t_1 = (-9^(1/2)-3)/(2*5)
t_1 = 0 or t_1 = -3/5
t_1 = -3/5
x^-1+3/5 = 0
1*x^-1 = -3/5 // : 1
x^-1 = -3/5
-1 < 0
1/(x^1) = -3/5 // * x^1
1 = -3/5*x^1 // : -3/5
-5/3 = x^1
x = -5/3
t_1 = 0
x^-1+0 = 0
x^-1 = 0
1*x^-1 = 0 // : 1
x^-1 = 0
x naleu017Cy do O
x = -5/3
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