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D( y )
5*y^2-(30*y)-35 = 0
5*y^2-(30*y)-35 = 0
5*y^2-(30*y)-35 = 0
5*y^2-30*y-35 = 0
5*y^2-30*y-35 = 0
DELTA = (-30)^2-(-35*4*5)
DELTA = 1600
DELTA > 0
y = (1600^(1/2)+30)/(2*5) or y = (30-1600^(1/2))/(2*5)
y = 7 or y = -1
y in (-oo:-1) U (-1:7) U (7:+oo)
(y^2-49)/(5*y^2-(30*y)-35) = 0
(y^2-49)/(5*y^2-30*y-35) = 0
5*y^2-30*y-35 = 0
5*(y^2-6*y-7) = 0
y^2-6*y-7 = 0
DELTA = (-6)^2-(-7*1*4)
DELTA = 64
DELTA > 0
y = (64^(1/2)+6)/(1*2) or y = (6-64^(1/2))/(1*2)
y = 7 or y = -1
5*(y+1)*(y-7) = 0
(y^2-49)/(5*(y+1)*(y-7)) = 0
1*y^2 = 49 // : 1
y^2 = 49
y^2 = 49 // ^ 1/2
abs(y) = 7
y = 7 or y = -7
y in { 7}
y = -7
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