(r^2-2r)/(r^2-4)

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Solution for (r^2-2r)/(r^2-4) equation: 


D( r )

r^2-4 = 0

r^2-4 = 0

r^2-4 = 0

1*r^2 = 4 // : 1

r^2 = 4

r^2 = 4 // ^ 1/2

abs(r) = 2

r = 2 or r = -2

r in (-oo:-2) U (-2:2) U (2:+oo)

(r^2-(2*r))/(r^2-4) = 0

(r^2-2*r)/(r^2-4) = 0

r^2-2*r = 0

r*(r-2) = 0

r-2 = 0 // + 2

r = 2

r*(r-2) = 0

(r*(r-2))/(r^2-4) = 0

( r-2 )

r-2 = 0 // + 2

r = 2

( r )

r = 0

r in { 2} 

r = 0

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