-4/x^2-7

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Solution for -4/x^2-7 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)

-4/(x^2)-7 = 0

-4*x^-2 = 7 // : -4

x^-2 = -7/4

-2 < 0

1/(x^2) = -7/4 // * x^2

1 = -7/4*x^2 // : -7/4

-4/7 = x^2

x belongs to the empty set

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