7=80/x^2

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Solution for 7=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)

7 = 80/(x^2) // - 80/(x^2)

7-(80/(x^2)) = 0

7-80*x^-2 = 0

-80*x^-2 = -7 // : -80

x^-2 = 7/80

-2 < 0

1/(x^2) = 7/80 // * x^2

1 = 7/80*x^2 // : 7/80

80/7 = x^2

x^2 = 80/7 // ^ 1/2

abs(x) = (80/7)^(1/2)

x = (80/7)^(1/2) or x = -(80/7)^(1/2)

x in { (80/7)^(1/2), -(80/7)^(1/2) }

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