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D( x )
x^2-(2*x)-8 = 0
x^2-(2*x)-8 = 0
x^2-(2*x)-8 = 0
x^2-2*x-8 = 0
x^2-2*x-8 = 0
DELTA = (-2)^2-(-8*1*4)
DELTA = 36
DELTA > 0
x = (36^(1/2)+2)/(1*2) or x = (2-36^(1/2))/(1*2)
x = 4 or x = -2
x in (-oo:-2) U (-2:4) U (4:+oo)
(5-(4*x))/(x^2-(2*x)-8) = 0
(5-4*x)/(x^2-2*x-8) = 0
x^2-2*x-8 = 0
x^2-2*x-8 = 0
DELTA = (-2)^2-(-8*1*4)
DELTA = 36
DELTA > 0
x = (36^(1/2)+2)/(1*2) or x = (2-36^(1/2))/(1*2)
x = 4 or x = -2
(x+2)*(x-4) = 0
(5-4*x)/((x+2)*(x-4)) = 0
5-4*x = 0 // - 5
-4*x = -5 // : -4
x = -5/(-4)
x = 5/4
x = 5/4
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