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D( y )
5*y^2-(20*y)-160 = 0
5*y^2-(20*y)-160 = 0
5*y^2-(20*y)-160 = 0
5*y^2-20*y-160 = 0
5*y^2-20*y-160 = 0
DELTA = (-20)^2-(-160*4*5)
DELTA = 3600
DELTA > 0
y = (3600^(1/2)+20)/(2*5) or y = (20-3600^(1/2))/(2*5)
y = 8 or y = -4
y in (-oo:-4) U (-4:8) U (8:+oo)
(y^2-(5*y)-24)/(5*y^2-(20*y)-160) = 0
(y^2-5*y-24)/(5*y^2-20*y-160) = 0
y^2-5*y-24 = 0
y^2-5*y-24 = 0
DELTA = (-5)^2-(-24*1*4)
DELTA = 121
DELTA > 0
y = (121^(1/2)+5)/(1*2) or y = (5-121^(1/2))/(1*2)
y = 8 or y = -3
(y+3)*(y-8) = 0
5*y^2-20*y-160 = 0
5*(y^2-4*y-32) = 0
y^2-4*y-32 = 0
DELTA = (-4)^2-(-32*1*4)
DELTA = 144
DELTA > 0
y = (144^(1/2)+4)/(1*2) or y = (4-144^(1/2))/(1*2)
y = 8 or y = -4
5*(y+4)*(y-8) = 0
((y+3)*(y-8))/(5*(y+4)*(y-8)) = 0
( y+3 )
y+3 = 0 // - 3
y = -3
( y-8 )
y-8 = 0 // + 8
y = 8
y in { 8}
y = -3
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