13=w-4/w

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Solution for 13=w-4/w equation: 


D( w )

w = 0

w = 0

w = 0

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

13 = w-(4/w) // - w-(4/w)

4/w-w+13 = 0

4*w^-1-1*w^1+13*w^0 = 0

(13*w^1-1*w^2+4*w^0)/(w^1) = 0 // * w^2

w^1*(13*w^1-1*w^2+4*w^0) = 0

w^1

13*w-w^2+4 = 0

13*w-w^2+4 = 0

DELTA = 13^2-(-1*4*4)

DELTA = 185

DELTA > 0

w = (185^(1/2)-13)/(-1*2) or w = (-185^(1/2)-13)/(-1*2)

w = (185^(1/2)-13)/(-2) or w = (185^(1/2)+13)/2

w in { (185^(1/2)-13)/(-2), (185^(1/2)+13)/2} 

w in { (185^(1/2)-13)/(-2), (185^(1/2)+13)/2 }

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