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D( y )
4*y^2-(20*y) = 0
4*y^2-(20*y) = 0
4*y^2-(20*y) = 0
4*y^2-20*y = 0
4*y^2-20*y = 0
DELTA = (-20)^2-(0*4*4)
DELTA = 400
DELTA > 0
y = (400^(1/2)+20)/(2*4) or y = (20-400^(1/2))/(2*4)
y = 5 or y = 0
y in (-oo:0) U (0:5) U (5:+oo)
(8*y^2-(28*y))/(4*y^2-(20*y)) = 0
(8*y^2-28*y)/(4*y^2-20*y) = 0
8*y^2-28*y = 0
4*y*(2*y-7) = 0
2*y-7 = 0 // + 7
2*y = 7 // : 2
y = 7/2
4*y*(y-7/2) = 0
4*y^2-20*y = 0
4*y*(y-5) = 0
y-5 = 0 // + 5
y = 5
4*y*(y-5) = 0
(4*y*(y-7/2))/(4*y*(y-5)) = 0
( 4*y )
4*y = 0 // : 4
y = 0
( y-7/2 )
y-7/2 = 0 // + 7/2
y = 7/2
y in { 0}
y = 7/2
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