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D( y )
8*y^2+3*y = 0
8*y^2+3*y = 0
8*y^2+3*y = 0
8*y^2+3*y = 0
DELTA = 3^2-(0*4*8)
DELTA = 9
DELTA > 0
y = (9^(1/2)-3)/(2*8) or y = (-9^(1/2)-3)/(2*8)
y = 0 or y = -3/8
y in (-oo:-3/8) U (-3/8:0) U (0:+oo)
(4-(7*y^2))/(8*y^2+3*y) = 0
(4-7*y^2)/(8*y^2+3*y) = 0
8*y^2+3*y = 0
y*(8*y+3) = 0
8*y+3 = 0 // - 3
8*y = -3 // : 8
y = -3/8
y*(y+3/8) = 0
(4-7*y^2)/(y*(y+3/8)) = 0
-7*y^2 = -4 // : -7
y^2 = 4/7
y^2 = 4/7 // ^ 1/2
abs(y) = (4/7)^(1/2)
y = (4/7)^(1/2) or y = -(4/7)^(1/2)
y in { (4/7)^(1/2), -(4/7)^(1/2) }
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