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D( x )
x+2 = 0
x+2 = 0
x+2 = 0
x+2 = 0 // - 2
x = -2
x in (-oo:-2) U (-2:+oo)
(3*x^2-(2*x)-7)/(x+2) = 0
(3*x^2-2*x-7)/(x+2) = 0
3*x^2-2*x-7 = 0
3*x^2-2*x-7 = 0
DELTA = (-2)^2-(-7*3*4)
DELTA = 88
DELTA > 0
x = (88^(1/2)+2)/(2*3) or x = (2-88^(1/2))/(2*3)
x = (2*22^(1/2)+2)/6 or x = (2-2*22^(1/2))/6
(x-((2-2*22^(1/2))/6))*(x-((2*22^(1/2)+2)/6)) = 0
((x-((2-2*22^(1/2))/6))*(x-((2*22^(1/2)+2)/6)))/(x+2) = 0
( x-((2*22^(1/2)+2)/6) )
x-((2*22^(1/2)+2)/6) = 0 // + (2*22^(1/2)+2)/6
x = (2*22^(1/2)+2)/6
( x-((2-2*22^(1/2))/6) )
x-((2-2*22^(1/2))/6) = 0 // + (2-2*22^(1/2))/6
x = (2-2*22^(1/2))/6
x in { (2*22^(1/2)+2)/6, (2-2*22^(1/2))/6 }
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