r+2/r+4-3/r+1

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Solution for r+2/r+4-3/r+1 equation: 


D( r )

r = 0

r = 0

r = 0

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

r+2/r-(3/r)+1+4 = 0

r+2/r-3*r^-1+1+4 = 0

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

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

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

r^1

r^2+5*r-1 = 0

r^2+5*r-1 = 0

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

DELTA = 29

DELTA > 0

r = (29^(1/2)-5)/(1*2) or r = (-29^(1/2)-5)/(1*2)

r = (29^(1/2)-5)/2 or r = (-(29^(1/2)+5))/2

r in { (-(29^(1/2)+5))/2, (29^(1/2)-5)/2} 

r in { (-(29^(1/2)+5))/2, (29^(1/2)-5)/2 }

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