70=80/x^2

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Solution for 70=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)

70 = 80/(x^2) // - 80/(x^2)

70-(80/(x^2)) = 0

70-80*x^-2 = 0

-80*x^-2 = -70 // : -80

x^-2 = 7/8

-2 < 0

1/(x^2) = 7/8 // * x^2

1 = 7/8*x^2 // : 7/8

8/7 = x^2

x^2 = 8/7 // ^ 1/2

abs(x) = (8/7)^(1/2)

x = (8/7)^(1/2) or x = -(8/7)^(1/2)

x in { (8/7)^(1/2), -(8/7)^(1/2) }

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