(3r^2-3r)/(r-1)

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Solution for (3r^2-3r)/(r-1) equation: 


D( r )

r-1 = 0

r-1 = 0

r-1 = 0

r-1 = 0 // + 1

r = 1

r in (-oo:1) U (1:+oo)

(3*r^2-(3*r))/(r-1) = 0

(3*r^2-3*r)/(r-1) = 0

3*r^2-3*r = 0

3*r*(r-1) = 0

r-1 = 0 // + 1

r = 1

3*r*(r-1) = 0

3*r = 0

3*r = 0 // : 3

r = 0

r = 0

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