3/r^2-3r

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Solution for 3/r^2-3r equation: 


D( r )

r^2 = 0

r^2 = 0

r^2 = 0

1*r^2 = 0 // : 1

r^2 = 0

r = 0

r in (-oo:0) U (0:+oo)

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

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

3*r^-2-3*r^1 = 0

(3*r^0-3*r^3)/(r^2) = 0 // * r^4

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

r^2

3-3*r^3 = 0

{ 1, -1, 3, -3 }

1

r = 1

3-3*r^3 = 0

1

r-1

-3*r^2-3*r-3

3-3*r^3

r-1

3*r^3-3*r^2

3-3*r^2

3*r^2-3*r

3-3*r

3*r-3

0

-3*r^2-3*r-3 = 0

DELTA = (-3)^2-(-3*(-3)*4)

DELTA = -27

DELTA < 0

r in { 1} 

r = 1

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