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D( x )
x^2+2*x-15 = 0
x^2+2*x-15 = 0
x^2+2*x-15 = 0
x^2+2*x-15 = 0
DELTA = 2^2-(-15*1*4)
DELTA = 64
DELTA > 0
x = (64^(1/2)-2)/(1*2) or x = (-64^(1/2)-2)/(1*2)
x = 3 or x = -5
x in (-oo:-5) U (-5:3) U (3:+oo)
(x^2-(1*x)-6)/(x^2+2*x-15) = 0
(x^2-x-6)/(x^2+2*x-15) = 0
x^2-x-6 = 0
x^2-x-6 = 0
DELTA = (-1)^2-(-6*1*4)
DELTA = 25
DELTA > 0
x = (25^(1/2)+1)/(1*2) or x = (1-25^(1/2))/(1*2)
x = 3 or x = -2
(x+2)*(x-3) = 0
x^2+2*x-15 = 0
x^2+2*x-15 = 0
DELTA = 2^2-(-15*1*4)
DELTA = 64
DELTA > 0
x = (64^(1/2)-2)/(1*2) or x = (-64^(1/2)-2)/(1*2)
x = 3 or x = -5
(x+5)*(x-3) = 0
((x+2)*(x-3))/((x+5)*(x-3)) = 0
( x+2 )
x+2 = 0 // - 2
x = -2
( x-3 )
x-3 = 0 // + 3
x = 3
x in { 3}
x = -2
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