1/y^2=9

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Solution for 1/y^2=9 equation: 


D( y )

y^2 = 0

y^2 = 0

y^2 = 0

1*y^2 = 0 // : 1

y^2 = 0

y = 0

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

1/(y^2) = 9 // - 9

1/(y^2)-9 = 0

1*y^-2 = 9 // : 1

y^-2 = 9

-2 < 0

1/(y^2) = 9 // * y^2

1 = 9*y^2 // : 9

1/9 = y^2

y^2 = 1/9 // ^ 1/2

abs(y) = 1/3

y = 1/3 or y = -1/3

y in { 1/3, -1/3 }

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