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D( x )
5*x+10 = 0
5*x+10 = 0
5*x+10 = 0
5*x+10 = 0 // - 10
5*x = -10 // : 5
x = -10/5
x = -2
x in (-oo:-2) U (-2:+oo)
(2*x^2-(4*x)-4)/(5*x+10) = 0
(2*x^2-4*x-4)/(5*x+10) = 0
2*x^2-4*x-4 = 0
2*(x^2-2*x-2) = 0
x^2-2*x-2 = 0
DELTA = (-2)^2-(-2*1*4)
DELTA = 12
DELTA > 0
x = (12^(1/2)+2)/(1*2) or x = (2-12^(1/2))/(1*2)
x = (2*3^(1/2)+2)/2 or x = (2-2*3^(1/2))/2
2*(x-((2-2*3^(1/2))/2))*(x-((2*3^(1/2)+2)/2)) = 0
(2*(x-((2-2*3^(1/2))/2))*(x-((2*3^(1/2)+2)/2)))/(5*x+10) = 0
( x-((2*3^(1/2)+2)/2) )
x-((2*3^(1/2)+2)/2) = 0 // + (2*3^(1/2)+2)/2
x = (2*3^(1/2)+2)/2
( x-((2-2*3^(1/2))/2) )
x-((2-2*3^(1/2))/2) = 0 // + (2-2*3^(1/2))/2
x = (2-2*3^(1/2))/2
x in { (2*3^(1/2)+2)/2, (2-2*3^(1/2))/2 }
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