2/r+13/7r

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Solution for 2/r+13/7r equation: 


D( r )

r = 0

r = 0

r = 0

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

(13/7)*r+2/r = 0

13/7*r^1+2*r^-1 = 0

(13/7*r^2+2*r^0)/(r^1) = 0 // * r^2

r^1*(13/7*r^2+2*r^0) = 0

r^1

(13/7)*r^2+2 = 0

(13/7)*r^2+2 = 0

DELTA = 0^2-(2*4*(13/7))

DELTA = -104/7

DELTA < 0

r in { } 

r belongs to the empty set

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