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D( x )
x^2+3*x-10 = 0
x^2+3*x-10 = 0
x^2+3*x-10 = 0
x^2+3*x-10 = 0
DELTA = 3^2-(-10*1*4)
DELTA = 49
DELTA > 0
x = (49^(1/2)-3)/(1*2) or x = (-49^(1/2)-3)/(1*2)
x = 2 or x = -5
x in (-oo:-5) U (-5:2) U (2:+oo)
(3*x^2-(21*x)+30)/(x^2+3*x-10) = 0
(3*x^2-21*x+30)/(x^2+3*x-10) = 0
3*x^2-21*x+30 = 0
3*(x^2-7*x+10) = 0
x^2-7*x+10 = 0
DELTA = (-7)^2-(1*4*10)
DELTA = 9
DELTA > 0
x = (9^(1/2)+7)/(1*2) or x = (7-9^(1/2))/(1*2)
x = 5 or x = 2
3*(x-2)*(x-5) = 0
x^2+3*x-10 = 0
x^2+3*x-10 = 0
DELTA = 3^2-(-10*1*4)
DELTA = 49
DELTA > 0
x = (49^(1/2)-3)/(1*2) or x = (-49^(1/2)-3)/(1*2)
x = 2 or x = -5
(x+5)*(x-2) = 0
(3*(x-2)*(x-5))/((x+5)*(x-2)) = 0
( x-2 )
x-2 = 0 // + 2
x = 2
( x-5 )
x-5 = 0 // + 5
x = 5
x in { 2}
x = 5
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