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D( x )
x^2 = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
(9/8)*x+7/8 = 2/(x^2) // - 2/(x^2)
(9/8)*x-(2/(x^2))+7/8 = 0
(9/8)*x-2*x^-2+7/8 = 0
9/8*x^1-2*x^-2+7/8*x^0 = 0
(9/8*x^3+7/8*x^2-2*x^0)/(x^2) = 0 // * x^4
x^2*(9/8*x^3+7/8*x^2-2*x^0) = 0
x^2
(9/8)*x^3+(7/8)*x^2-2 = 0
(9/8)*x^3+(7/8)*x^2-2 = 0 // * 0
{ 1, -1, 2, -2, 4, -4, 8, -8, 16, -16 }
1
x = 1
9*x^3+7*x^2-16 = 0
1
x-1
9*x^2+16*x+16
9*x^3+7*x^2-16
x-1
9*x^2-9*x^3
16*x^2-16
16*x-16*x^2
16*x-16
16-16*x
0
9*x^2+16*x+16 = 0
DELTA = 16^2-(4*9*16)
DELTA = -320
DELTA < 0
x in { 1}
x = 1
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