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D( y )
5*y^2-(25*y)-120 = 0
5*y^2-(25*y)-120 = 0
5*y^2-(25*y)-120 = 0
5*y^2-25*y-120 = 0
5*y^2-25*y-120 = 0
DELTA = (-25)^2-(-120*4*5)
DELTA = 3025
DELTA > 0
y = (3025^(1/2)+25)/(2*5) or y = (25-3025^(1/2))/(2*5)
y = 8 or y = -3
y in (-oo:-3) U (-3:8) U (8:+oo)
(y^2-(4*y)-21)/(5*y^2-(25*y)-120) = 0
(y^2-4*y-21)/(5*y^2-25*y-120) = 0
y^2-4*y-21 = 0
y^2-4*y-21 = 0
DELTA = (-4)^2-(-21*1*4)
DELTA = 100
DELTA > 0
y = (100^(1/2)+4)/(1*2) or y = (4-100^(1/2))/(1*2)
y = 7 or y = -3
(y+3)*(y-7) = 0
5*y^2-25*y-120 = 0
5*(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
5*(y+3)*(y-8) = 0
((y+3)*(y-7))/(5*(y+3)*(y-8)) = 0
( y+3 )
y+3 = 0 // - 3
y = -3
( y-7 )
y-7 = 0 // + 7
y = 7
y in { -3}
y = 7
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