26=80/x^2

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Solution for 26=80/x^2 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)

26 = 80/(x^2) // - 80/(x^2)

26-(80/(x^2)) = 0

26-80*x^-2 = 0

-80*x^-2 = -26 // : -80

x^-2 = 13/40

-2 < 0

1/(x^2) = 13/40 // * x^2

1 = 13/40*x^2 // : 13/40

40/13 = x^2

x^2 = 40/13 // ^ 1/2

abs(x) = (40/13)^(1/2)

x = (40/13)^(1/2) or x = -(40/13)^(1/2)

x in { (40/13)^(1/2), -(40/13)^(1/2) }

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