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D( x )
x^2+5*x-50 = 0
x^2+5*x-50 = 0
x^2+5*x-50 = 0
x^2+5*x-50 = 0
DELTA = 5^2-(-50*1*4)
DELTA = 225
DELTA > 0
x = (225^(1/2)-5)/(1*2) or x = (-225^(1/2)-5)/(1*2)
x = 5 or x = -10
x in (-oo:-10) U (-10:5) U (5:+oo)
(x^2-25)/(x^2+5*x-50) = 0
x^2+5*x-50 = 0
x^2+5*x-50 = 0
DELTA = 5^2-(-50*1*4)
DELTA = 225
DELTA > 0
x = (225^(1/2)-5)/(1*2) or x = (-225^(1/2)-5)/(1*2)
x = 5 or x = -10
(x+10)*(x-5) = 0
(x^2-25)/((x+10)*(x-5)) = 0
1*x^2 = 25 // : 1
x^2 = 25
x^2 = 25 // ^ 1/2
abs(x) = 5
x = 5 or x = -5
x in { 5}
x = -5
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