-y=x/x^2+4

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Solution for -y=x/x^2+4 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 = x/(x^2)+4 // - x/(x^2)+4

-(x/(x^2))-y-4 = 0

-x^-1-y-4 = 0

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

x^-1 = -(y+4)

-1 < 0

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

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

-(y+4)^-1 = x^1

x = -(y+4)^-1

x = -(y+4)^-1

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