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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
-10 = x+24/x // - x+24/x
-x-(24/x)-10 = 0
-x-24*x^-1-10 = 0
-1*x^1-24*x^-1-10*x^0 = 0
(-1*x^2-10*x^1-24*x^0)/(x^1) = 0 // * x^2
x^1*(-1*x^2-10*x^1-24*x^0) = 0
x^1
-x^2-10*x-24 = 0
-x^2-10*x-24 = 0
DELTA = (-10)^2-(-24*(-1)*4)
DELTA = 4
DELTA > 0
x = (4^(1/2)+10)/(-1*2) or x = (10-4^(1/2))/(-1*2)
x = -6 or x = -4
x in { -6, -4}
x in { -6, -4 }
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