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