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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
y-(17/y)+8+9 = 0
y-17*y^-1+8+9 = 0
1*y^1-17*y^-1+17*y^0 = 0
(1*y^2+17*y^1-17*y^0)/(y^1) = 0 // * y^2
y^1*(1*y^2+17*y^1-17*y^0) = 0
y^1
y^2+17*y-17 = 0
y^2+17*y-17 = 0
DELTA = 17^2-(-17*1*4)
DELTA = 357
DELTA > 0
y = (357^(1/2)-17)/(1*2) or y = (-357^(1/2)-17)/(1*2)
y = (357^(1/2)-17)/2 or y = (-(357^(1/2)+17))/2
y in { (-(357^(1/2)+17))/2, (357^(1/2)-17)/2}
y in { (-(357^(1/2)+17))/2, (357^(1/2)-17)/2 }
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