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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
24/X = 2*X-13 // - 2*X-13
24/X-(2*X)+13 = 0
24/X-2*X+13 = 0
24*X^-1-2*X^1+13*X^0 = 0
(13*X^1-2*X^2+24*X^0)/(X^1) = 0 // * X^2
X^1*(13*X^1-2*X^2+24*X^0) = 0
X^1
13*X-2*X^2+24 = 0
13*X-2*X^2+24 = 0
DELTA = 13^2-(-2*4*24)
DELTA = 361
DELTA > 0
X = (361^(1/2)-13)/(-2*2) or X = (-361^(1/2)-13)/(-2*2)
X = -3/2 or X = 8
X in { -3/2, 8}
X in { -3/2, 8 }
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