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

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Solution for 0=(-2x^2)/(x^2+4) equation: 


D( x )

x^2+4 = 0

x^2+4 = 0

x^2+4 = 0

1*x^2 = -4 // : 1

x^2 = -4

x in (-oo:+oo)

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

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

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

(2*x^2)/(x^2+4) = 0

2*x^2 = 0 // : 2

x^2 = 0

x = 0

x = 0

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