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D( y )
y = 0
y^2 = 0
y = 0
y = 0
y^2 = 0
y^2 = 0
1*y^2 = 0 // : 1
y^2 = 0
y = 0
y in (-oo:0) U (0:+oo)
6/y-(2/y)-3 = 7*y+3/(y^2)-9 // - 7*y+3/(y^2)-9
6/y-(7*y)-(2/y)-(3/(y^2))-3+9 = 0
6/y-7*y-2*y^-1-3*y^-2-3+9 = 0
4*y^-1-7*y^1-3*y^-2+6*y^0 = 0
(6*y^2-7*y^3+4*y^1-3*y^0)/(y^2) = 0 // * y^4
y^2*(6*y^2-7*y^3+4*y^1-3*y^0) = 0
y^2
6*y^2-7*y^3+4*y-3 = 0
{ 1, -1, 3, -3 }
1
y = 1
6*y^2-7*y^3+4*y-3 = 0
1
y-1
3-7*y^2-y
6*y^2-7*y^3+4*y-3
y-1
7*y^3-7*y^2
4*y-y^2-3
y^2-y
3*y-3
3-3*y
0
3-7*y^2-y = 0
DELTA = (-1)^2-(-7*3*4)
DELTA = 85
DELTA > 0
y = (85^(1/2)+1)/(-7*2) or y = (1-85^(1/2))/(-7*2)
y = (85^(1/2)+1)/(-14) or y = (1-85^(1/2))/(-14)
y in { (85^(1/2)+1)/(-14), (1-85^(1/2))/(-14), 1}
y in { (85^(1/2)+1)/(-14), (1-85^(1/2))/(-14), 1 }
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