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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4/x = (9/8)*x+1 // - (9/8)*x+1
4/x-((9/8)*x)-1 = 0
(-9/8)*x+4/x-1 = 0
4*x^-1-9/8*x^1-1*x^0 = 0
(4*x^0-9/8*x^2-1*x^1)/(x^1) = 0 // * x^2
x^1*(4*x^0-9/8*x^2-1*x^1) = 0
x^1
(-9/8)*x^2-x+4 = 0
(-9/8)*x^2-x+4 = 0
DELTA = (-1)^2-(4*4*(-9/8))
DELTA = 19
DELTA > 0
x = (19^(1/2)+1)/(2*(-9/8)) or x = (1-19^(1/2))/(2*(-9/8))
x = -4/9*(19^(1/2)+1) or x = -4/9*(1-19^(1/2))
x in { -4/9*(19^(1/2)+1), -4/9*(1-19^(1/2))}
x in { -4/9*(19^(1/2)+1), -4/9*(1-19^(1/2)) }
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