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D( x )
10*x^2+10*x-20 = 0
10*x^2+10*x-20 = 0
10*x^2+10*x-20 = 0
10*x^2+10*x-20 = 0
DELTA = 10^2-(-20*4*10)
DELTA = 900
DELTA > 0
x = (900^(1/2)-10)/(2*10) or x = (-900^(1/2)-10)/(2*10)
x = 1 or x = -2
x in (-oo:-2) U (-2:1) U (1:+oo)
(5*x^2-20)/(10*x^2+10*x-20) = 0
10*x^2+10*x-20 = 0
10*(x^2+x-2) = 0
x^2+x-2 = 0
DELTA = 1^2-(-2*1*4)
DELTA = 9
DELTA > 0
x = (9^(1/2)-1)/(1*2) or x = (-9^(1/2)-1)/(1*2)
x = 1 or x = -2
10*(x+2)*(x-1) = 0
(5*x^2-20)/(10*(x+2)*(x-1)) = 0
5*x^2 = 20 // : 5
x^2 = 4
x^2 = 4 // ^ 1/2
abs(x) = 2
x = 2 or x = -2
x in { -2}
x = 2
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