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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
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 = (2-64^(1/2))/(1*2)
x = 5 or x = -3
x in (-oo:-3) U (-3:5) U (5:+oo)
(2*x-8)/(x^2-(2*x)-15) = 0
(2*x-8)/(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 = (2-64^(1/2))/(1*2)
x = 5 or x = -3
(x+3)*(x-5) = 0
(2*x-8)/((x+3)*(x-5)) = 0
2*x-8 = 0 // + 8
2*x = 8 // : 2
x = 8/2
x = 4
x = 4
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