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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
48/y+3 = 8*(y+3) // - 8*(y+3)
48/y-(8*(y+3))+3 = 0
48/y-8*(y+3)+3 = 0
(-8*y*(y+3))/y+48/y+(3*y)/y = 0
3*y-8*y*(y+3)+48 = 0
3*y-8*y^2-24*y+48 = 0
48-8*y^2-21*y = 0
48-8*y^2-21*y = 0
48-8*y^2-21*y = 0
DELTA = (-21)^2-(-8*4*48)
DELTA = 1977
DELTA > 0
y = (1977^(1/2)+21)/(-8*2) or y = (21-1977^(1/2))/(-8*2)
y = (1977^(1/2)+21)/(-16) or y = (21-1977^(1/2))/(-16)
(y-((1977^(1/2)+21)/(-16)))*(y-((21-1977^(1/2))/(-16))) = 0
((y-((1977^(1/2)+21)/(-16)))*(y-((21-1977^(1/2))/(-16))))/y = 0
((y-((1977^(1/2)+21)/(-16)))*(y-((21-1977^(1/2))/(-16))))/y = 0 // * y
(y-((1977^(1/2)+21)/(-16)))*(y-((21-1977^(1/2))/(-16))) = 0
( y-((1977^(1/2)+21)/(-16)) )
y-((1977^(1/2)+21)/(-16)) = 0 // + (1977^(1/2)+21)/(-16)
y = (1977^(1/2)+21)/(-16)
( y-((21-1977^(1/2))/(-16)) )
y-((21-1977^(1/2))/(-16)) = 0 // + (21-1977^(1/2))/(-16)
y = (21-1977^(1/2))/(-16)
y in { (1977^(1/2)+21)/(-16), (21-1977^(1/2))/(-16) }
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