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D( y )
y^2-(5*y)+6 = 0
y^2-(5*y)+6 = 0
y^2-(5*y)+6 = 0
y^2-5*y+6 = 0
y^2-5*y+6 = 0
DELTA = (-5)^2-(1*4*6)
DELTA = 1
DELTA > 0
y = (1^(1/2)+5)/(1*2) or y = (5-1^(1/2))/(1*2)
y = 3 or y = 2
y in (-oo:2) U (2:3) U (3:+oo)
(2*y^2+2*y-12)/(y^2-(5*y)+6) = 0
(2*y^2+2*y-12)/(y^2-5*y+6) = 0
2*y^2+2*y-12 = 0
2*(y^2+y-6) = 0
y^2+y-6 = 0
DELTA = 1^2-(-6*1*4)
DELTA = 25
DELTA > 0
y = (25^(1/2)-1)/(1*2) or y = (-25^(1/2)-1)/(1*2)
y = 2 or y = -3
2*(y+3)*(y-2) = 0
y^2-5*y+6 = 0
y^2-5*y+6 = 0
DELTA = (-5)^2-(1*4*6)
DELTA = 1
DELTA > 0
y = (1^(1/2)+5)/(1*2) or y = (5-1^(1/2))/(1*2)
y = 3 or y = 2
(y-2)*(y-3) = 0
(2*(y+3)*(y-2))/((y-2)*(y-3)) = 0
( y+3 )
y+3 = 0 // - 3
y = -3
( y-2 )
y-2 = 0 // + 2
y = 2
y in { 2}
y = -3
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