2x^-2/5-4=4

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Solution for 2x^-2/5-4=4 equation: 


D( x )

x = 0

x = 0

x = 0

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

(2*x^-2)/5-4 = 4 // - 4

(2*x^-2)/5-4-4 = 0

2/5*x^-2 = 8 // : 2/5

x^-2 = 20

-2 < 0

1/(x^2) = 20 // * x^2

1 = 20*x^2 // : 20

1/20 = x^2

x^2 = 1/20 // ^ 1/2

abs(x) = (1/20)^(1/2)

x = (1/20)^(1/2) or x = -(1/20)^(1/2)

x in { (1/20)^(1/2), -(1/20)^(1/2) }

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