7/y^2-1

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Solution for 7/y^2-1 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)

7/(y^2)-1 = 0

7*y^-2 = 1 // : 7

y^-2 = 1/7

-2 < 0

1/(y^2) = 1/7 // * y^2

1 = 1/7*y^2 // : 1/7

7 = y^2

y^2 = 7 // ^ 1/2

abs(y) = 7^(1/2)

y = 7^(1/2) or y = -7^(1/2)

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

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