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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)
5/(x^2)-(54/x) = 11 // - 11
5/(x^2)-(54/x)-11 = 0
5/(x^2)-54*x^-1-11 = 0
5*x^-2-54*x^-1-11 = 0
t_1 = x^-1
5*t_1^2-54*t_1^1-11 = 0
5*t_1^2-54*t_1-11 = 0
DELTA = (-54)^2-(-11*4*5)
DELTA = 3136
DELTA > 0
t_1 = (3136^(1/2)+54)/(2*5) or t_1 = (54-3136^(1/2))/(2*5)
t_1 = 11 or t_1 = -1/5
t_1 = -1/5
x^-1+1/5 = 0
1*x^-1 = -1/5 // : 1
x^-1 = -1/5
-1 < 0
1/(x^1) = -1/5 // * x^1
1 = -1/5*x^1 // : -1/5
-5 = x^1
x = -5
t_1 = 11
x^-1-11 = 0
1*x^-1 = 11 // : 1
x^-1 = 11
-1 < 0
1/(x^1) = 11 // * x^1
1 = 11*x^1 // : 11
1/11 = x^1
x = 1/11
x in { -5, 1/11 }
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