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D( y )
y^2-(2*y)-15 = 0
y^2-(2*y)-15 = 0
y^2-(2*y)-15 = 0
y^2-2*y-15 = 0
y^2-2*y-15 = 0
DELTA = (-2)^2-(-15*1*4)
DELTA = 64
DELTA > 0
y = (64^(1/2)+2)/(1*2) or y = (2-64^(1/2))/(1*2)
y = 5 or y = -3
y in (-oo:-3) U (-3:5) U (5:+oo)
(y^2-(4*y)-5)/(y^2-(2*y)-15) = 0
(y^2-4*y-5)/(y^2-2*y-15) = 0
y^2-4*y-5 = 0
y^2-4*y-5 = 0
DELTA = (-4)^2-(-5*1*4)
DELTA = 36
DELTA > 0
y = (36^(1/2)+4)/(1*2) or y = (4-36^(1/2))/(1*2)
y = 5 or y = -1
(y+1)*(y-5) = 0
y^2-2*y-15 = 0
y^2-2*y-15 = 0
DELTA = (-2)^2-(-15*1*4)
DELTA = 64
DELTA > 0
y = (64^(1/2)+2)/(1*2) or y = (2-64^(1/2))/(1*2)
y = 5 or y = -3
(y+3)*(y-5) = 0
((y+1)*(y-5))/((y+3)*(y-5)) = 0
( y+1 )
y+1 = 0 // - 1
y = -1
( y-5 )
y-5 = 0 // + 5
y = 5
y in { 5}
y = -1
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