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D( w )
2*2*w = 0
2*2*w = 0
2*2*w = 0
4*w = 0 // : 4
w = 0
w in (-oo:0) U (0:+oo)
(1*(5*w-120))/(2*2*w) = (-15/2)*w // - (-15/2)*w
(1*(5*w-120))/(2*2*w)-((-15/2)*w) = 0
(5*w-120)/(2*2*w)+(15/2)*w = 0
(5*w-120)/(4*w)+(15*w)/2 = 0
(2*(5*w-120))/(2*4*w)+(4*15*w*w)/(2*4*w) = 0
2*(5*w-120)+4*15*w*w = 0
60*w^2+10*w-240 = 0
60*w^2+10*w-240 = 0
10*(6*w^2+w-24) = 0
6*w^2+w-24 = 0
DELTA = 1^2-(-24*4*6)
DELTA = 577
DELTA > 0
w = (577^(1/2)-1)/(2*6) or w = (-577^(1/2)-1)/(2*6)
w = (577^(1/2)-1)/12 or w = (-(577^(1/2)+1))/12
10*(w+(577^(1/2)+1)/12)*(w-((577^(1/2)-1)/12)) = 0
(10*(w+(577^(1/2)+1)/12)*(w-((577^(1/2)-1)/12)))/(2*4*w) = 0
(10*(w+(577^(1/2)+1)/12)*(w-((577^(1/2)-1)/12)))/(2*4*w) = 0 // * 2*4*w
10*(w+(577^(1/2)+1)/12)*(w-((577^(1/2)-1)/12)) = 0
( w+(577^(1/2)+1)/12 )
w+(577^(1/2)+1)/12 = 0 // - (577^(1/2)+1)/12
w = -((577^(1/2)+1)/12)
( w-((577^(1/2)-1)/12) )
w-((577^(1/2)-1)/12) = 0 // + (577^(1/2)-1)/12
w = (577^(1/2)-1)/12
w in { -((577^(1/2)+1)/12), (577^(1/2)-1)/12 }
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