9/a^2-9

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Solution for 9/a^2-9 equation: 


D( a )

a^2 = 0

a^2 = 0

a^2 = 0

1*a^2 = 0 // : 1

a^2 = 0

a = 0

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

9/(a^2)-9 = 0

9*a^-2 = 9 // : 9

a^-2 = 1

-2 < 0

1/(a^2) = 1 // * a^2

1 = 1*a^2 // : 1

1 = a^2

a^2 = 1 // ^ 1/2

abs(a) = 1

a = 1 or a = -1

a in { 1, -1 }

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