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D( x )
x^2+2*x-8 = 0
x^2+2*x-8 = 0
x^2+2*x-8 = 0
x^2+2*x-8 = 0
DELTA = 2^2-(-8*1*4)
DELTA = 36
DELTA > 0
x = (36^(1/2)-2)/(1*2) or x = (-36^(1/2)-2)/(1*2)
x = 2 or x = -4
x in (-oo:-4) U (-4:2) U (2:+oo)
(3*x^2+7*x-20)/(x^2+2*x-8) = 0
3*x^2+7*x-20 = 0
3*x^2+7*x-20 = 0
DELTA = 7^2-(-20*3*4)
DELTA = 289
DELTA > 0
x = (289^(1/2)-7)/(2*3) or x = (-289^(1/2)-7)/(2*3)
x = 5/3 or x = -4
(x+4)*(x-5/3) = 0
x^2+2*x-8 = 0
x^2+2*x-8 = 0
DELTA = 2^2-(-8*1*4)
DELTA = 36
DELTA > 0
x = (36^(1/2)-2)/(1*2) or x = (-36^(1/2)-2)/(1*2)
x = 2 or x = -4
(x+4)*(x-2) = 0
((x+4)*(x-5/3))/((x+4)*(x-2)) = 0
( x+4 )
x+4 = 0 // - 4
x = -4
( x-5/3 )
x-5/3 = 0 // + 5/3
x = 5/3
x in { -4}
x = 5/3
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