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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)
2/x+4/(x^2) = 7 // - 7
2/x+4/(x^2)-7 = 0
2*x^-1+4*x^-2-7 = 0
t_1 = x^-1
4*t_1^2+2*t_1^1-7 = 0
4*t_1^2+2*t_1-7 = 0
DELTA = 2^2-(-7*4*4)
DELTA = 116
DELTA > 0
t_1 = (116^(1/2)-2)/(2*4) or t_1 = (-116^(1/2)-2)/(2*4)
t_1 = (2*29^(1/2)-2)/8 or t_1 = (-2*29^(1/2)-2)/8
t_1 = (-2*29^(1/2)-2)/8
x^-1-((-2*29^(1/2)-2)/8) = 0
1*x^-1 = (-2*29^(1/2)-2)/8 // : 1
x^-1 = (-2*29^(1/2)-2)/8
-1 < 0
1/(x^1) = (-2*29^(1/2)-2)/8 // * x^1
1 = ((-2*29^(1/2)-2)/8)*x^1 // : (-2*29^(1/2)-2)/8
8*(-2*29^(1/2)-2)^-1 = x^1
x = 8*(-2*29^(1/2)-2)^-1
t_1 = (2*29^(1/2)-2)/8
x^-1-((2*29^(1/2)-2)/8) = 0
1*x^-1 = (2*29^(1/2)-2)/8 // : 1
x^-1 = (2*29^(1/2)-2)/8
-1 < 0
1/(x^1) = (2*29^(1/2)-2)/8 // * x^1
1 = ((2*29^(1/2)-2)/8)*x^1 // : (2*29^(1/2)-2)/8
8*(2*29^(1/2)-2)^-1 = x^1
x = 8*(2*29^(1/2)-2)^-1
x in { 8*(-2*29^(1/2)-2)^-1, 8*(2*29^(1/2)-2)^-1 }
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