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D( y )
4*y = 0
4*y = 0
4*y = 0
4*y = 0 // : 4
y = 0
y in (-oo:0) U (0:+oo)
(20*y^2-(3*y)-8)/(4*y) = 0
(20*y^2-3*y-8)/(4*y) = 0
20*y^2-3*y-8 = 0
20*y^2-3*y-8 = 0
DELTA = (-3)^2-(-8*4*20)
DELTA = 649
DELTA > 0
y = (649^(1/2)+3)/(2*20) or y = (3-649^(1/2))/(2*20)
y = (649^(1/2)+3)/40 or y = (3-649^(1/2))/40
(y-((3-649^(1/2))/40))*(y-((649^(1/2)+3)/40)) = 0
((y-((3-649^(1/2))/40))*(y-((649^(1/2)+3)/40)))/(4*y) = 0
( y-((3-649^(1/2))/40) )
y-((3-649^(1/2))/40) = 0 // + (3-649^(1/2))/40
y = (3-649^(1/2))/40
( y-((649^(1/2)+3)/40) )
y-((649^(1/2)+3)/40) = 0 // + (649^(1/2)+3)/40
y = (649^(1/2)+3)/40
y in { (3-649^(1/2))/40, (649^(1/2)+3)/40 }
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