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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
7/y-y-(6/8)-8 = 0
7/y-y-3/4-8 = 0
7*y^-1-1*y^1-35/4*y^0 = 0
(7*y^0-1*y^2-35/4*y^1)/(y^1) = 0 // * y^2
y^1*(7*y^0-1*y^2-35/4*y^1) = 0
y^1
(-35/4)*y-y^2+7 = 0
(-35/4)*y-y^2+7 = 0
DELTA = (-35/4)^2-(-1*4*7)
DELTA = 1673/16
DELTA > 0
y = ((1673/16)^(1/2)-(-35/4))/(-1*2) or y = (-(-35/4)-(1673/16)^(1/2))/(-1*2)
y = ((1673/16)^(1/2)+35/4)/(-2) or y = (35/4-(1673/16)^(1/2))/(-2)
y in { ((1673/16)^(1/2)+35/4)/(-2), (35/4-(1673/16)^(1/2))/(-2)}
y in { ((1673/16)^(1/2)+35/4)/(-2), (35/4-(1673/16)^(1/2))/(-2) }
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