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D( x )
x-8 = 0
x-8 = 0
x-8 = 0
x-8 = 0 // + 8
x = 8
x in (-oo:8) U (8:+oo)
(x^2-(6*x)-16)/(x-8) = 0
(x^2-6*x-16)/(x-8) = 0
x^2-6*x-16 = 0
x^2-6*x-16 = 0
DELTA = (-6)^2-(-16*1*4)
DELTA = 100
DELTA > 0
x = (100^(1/2)+6)/(1*2) or x = (6-100^(1/2))/(1*2)
x = 8 or x = -2
(x+2)*(x-8) = 0
x+2 = 0
x+2 = 0 // - 2
x = -2
x = -2
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