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D( x )
x = 0
x^2 = 0
x = 0
x = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
9-(1/x) = 8/(x^2) // - 8/(x^2)
9-(1/x)-(8/(x^2)) = 0
9-x^-1-8*x^-2 = 0
t_1 = x^-1
9-8*t_1^2-1*t_1^1 = 0
9-8*t_1^2-t_1 = 0
DELTA = (-1)^2-(-8*4*9)
DELTA = 289
DELTA > 0
t_1 = (289^(1/2)+1)/(-8*2) or t_1 = (1-289^(1/2))/(-8*2)
t_1 = -9/8 or t_1 = 1
t_1 = -9/8
x^-1+9/8 = 0
1*x^-1 = -9/8 // : 1
x^-1 = -9/8
-1 < 0
1/(x^1) = -9/8 // * x^1
1 = -9/8*x^1 // : -9/8
-8/9 = x^1
x = -8/9
t_1 = 1
x^-1-1 = 0
1*x^-1 = 1 // : 1
x^-1 = 1
-1 < 0
1/(x^1) = 1 // * x^1
1 = 1*x^1 // : 1
1 = x^1
x = 1
x in { -8/9, 1 }
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