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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2*x+12/x+10 = 0
2*x^1+12*x^-1+10*x^0 = 0
(2*x^2+10*x^1+12*x^0)/(x^1) = 0 // * x^2
x^1*(2*x^2+10*x^1+12*x^0) = 0
x^1
2*x^2+10*x+12 = 0
2*x^2+10*x+12 = 0
DELTA = 10^2-(2*4*12)
DELTA = 4
DELTA > 0
x = (4^(1/2)-10)/(2*2) or x = (-4^(1/2)-10)/(2*2)
x = -2 or x = -3
x in { -3, -2}
x in { -3, -2 }
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