3/(r+1)+2/3r

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Solution for 3/(r+1)+2/3r 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+1)+(2/3)*r = 0

3/(r+1)+(2*r)/3 = 0

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

2*r*(r+1)+9 = 0

2*r^2+2*r+9 = 0

2*r^2+2*r+9 = 0

2*r^2+2*r+9 = 0

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

DELTA = -68

DELTA < 0

1 = 0

1/(3*(r+1)) = 0

1/(3*(r+1)) = 0 // * 3*(r+1)

1 = 0

r belongs to the empty set

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