(n^2-2n)/(n^2-9n)

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Solution for (n^2-2n)/(n^2-9n) equation: 


D( n )

n^2-(9*n) = 0

n^2-(9*n) = 0

n^2-(9*n) = 0

n^2-9*n = 0

n^2-9*n = 0

DELTA = (-9)^2-(0*1*4)

DELTA = 81

DELTA > 0

n = (81^(1/2)+9)/(1*2) or n = (9-81^(1/2))/(1*2)

n = 9 or n = 0

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

(n^2-(2*n))/(n^2-(9*n)) = 0

(n^2-2*n)/(n^2-9*n) = 0

n^2-2*n = 0

n*(n-2) = 0

n-2 = 0 // + 2

n = 2

n*(n-2) = 0

n^2-9*n = 0

n*(n-9) = 0

n-9 = 0 // + 9

n = 9

n*(n-9) = 0

(n*(n-2))/(n*(n-9)) = 0

( n-2 )

n-2 = 0 // + 2

n = 2

( n )

n = 0

n in { 0} 

n = 2

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