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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)
(45-(5*x^2))/(x^2+2*x-15) = 0
(45-5*x^2)/(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+5)*(x-3) = 0
(45-5*x^2)/((x+5)*(x-3)) = 0
-5*x^2 = -45 // : -5
x^2 = 9
x^2 = 9 // ^ 1/2
abs(x) = 3
x = 3 or x = -3
x in { 3}
x = -3
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