((x^2-81)/(x))/((x+9)/(x-9))

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Solution for ((x^2-81)/(x))/((x+9)/(x-9)) equation: 


D( x )

x = 0

(x+9)/(x-9) = 0

x-9 = 0

x = 0

x = 0

(x+9)/(x-9) = 0

(x+9)/(x-9) = 0

x+9 = 0 // - 9

x = -9

x-9 = 0

x-9 = 0

x-9 = 0 // + 9

x = 9

x in (-oo:-9) U (-9:0) U (0:9) U (9:+oo)

((x^2-81)/x)/((x+9)/(x-9)) = 0

((x^2-81)*(x-9))/(x*(x+9)) = 0

( x-9 )

x-9 = 0 // + 9

x = 9

( x^2-81 )

1*x^2 = 81 // : 1

x^2 = 81

x^2 = 81 // ^ 1/2

abs(x) = 9

x = 9 or x = -9

x in { 9} 

x in { -9} 

x belongs to the empty set

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