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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x+9 = (-7/4)*x-3 // - (-7/4)*x-3
2/x-((-7/4)*x)+3+9 = 0
(7/4)*x+2/x+3+9 = 0
7/4*x^1+2*x^-1+12*x^0 = 0
(7/4*x^2+12*x^1+2*x^0)/(x^1) = 0 // * x^2
x^1*(7/4*x^2+12*x^1+2*x^0) = 0
x^1
(7/4)*x^2+12*x+2 = 0
(7/4)*x^2+12*x+2 = 0
DELTA = 12^2-(2*4*(7/4))
DELTA = 130
DELTA > 0
x = (130^(1/2)-12)/(2*(7/4)) or x = (-130^(1/2)-12)/(2*(7/4))
x = 2/7*(130^(1/2)-12) or x = -2/7*(130^(1/2)+12)
x in { -2/7*(130^(1/2)+12), 2/7*(130^(1/2)-12)}
x in { -2/7*(130^(1/2)+12), 2/7*(130^(1/2)-12) }
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