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D( x )
x+4 = 0
x+4 = 0
x+4 = 0
x+4 = 0 // - 4
x = -4
x in (-oo:-4) U (-4:+oo)
(5*x^2+26*x+24)/(x+4) = 0
5*x^2+26*x+24 = 0
5*x^2+26*x+24 = 0
DELTA = 26^2-(4*5*24)
DELTA = 196
DELTA > 0
x = (196^(1/2)-26)/(2*5) or x = (-196^(1/2)-26)/(2*5)
x = -6/5 or x = -4
(x+4)*(x+6/5) = 0
x+6/5 = 0
x+6/5 = 0 // - 6/5
x = -6/5
x = -6/5
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