y=1-4x/x^2+1

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Solution for y=1-4x/x^2+1 equation: 


D( x )

x^2 = 0

x^2 = 0

x^2 = 0

1*x^2 = 0 // : 1

x^2 = 0

x = 0

x in (-oo:0) U (0:+oo)

y = 1-((4*x)/(x^2))+1 // - 1-((4*x)/(x^2))+1

(4*x)/(x^2)+y-1-1 = 0

4*x^-1 = -(y-2) // : 4

x^-1 = (2-y)/4

-1 < 0

1/(x^1) = (2-y)/4 // * x^1

1 = x^1*((2-y)/4) // : (2-y)/4

4*(2-y)^-1 = x^1

x = 4*(2-y)^-1

x = 4*(2-y)^-1

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