r+4/r=-5

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Solution for r+4/r=-5 equation: 


D( r )

r = 0

r = 0

r = 0

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

r+4/r = -5 // + 5

r+4/r+5 = 0

1*r^1+4*r^-1+5*r^0 = 0

(1*r^2+5*r^1+4*r^0)/(r^1) = 0 // * r^2

r^1*(1*r^2+5*r^1+4*r^0) = 0

r^1

r^2+5*r+4 = 0

r^2+5*r+4 = 0

DELTA = 5^2-(1*4*4)

DELTA = 9

DELTA > 0

r = (9^(1/2)-5)/(1*2) or r = (-9^(1/2)-5)/(1*2)

r = -1 or r = -4

r in { -4, -1} 

r in { -4, -1 }

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