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D( x )
x-8 = 0
x+8 = 0
x-8 = 0
x-8 = 0
x-8 = 0 // + 8
x = 8
x+8 = 0
x+8 = 0
x+8 = 0 // - 8
x = -8
x in (-oo:-8) U (-8:8) U (8:+oo)
((x^2-(16*x)+64)/(x+8))*((x^2+14*x+48)/(x-8)) = 0
((x^2-16*x+64)/(x+8))*((x^2+14*x+48)/(x-8)) = 0
((x^2-16*x+64)*(x^2+14*x+48))/((x+8)*(x-8)) = 0
x^2-16*x+64 = 0
x^2-16*x+64 = 0
DELTA = (-16)^2-(1*4*64)
DELTA = 0
x = 16/(1*2)
x = 8 or x = 8
(x-8)^2 = 0
x^2+14*x+48 = 0
x^2+14*x+48 = 0
DELTA = 14^2-(1*4*48)
DELTA = 4
DELTA > 0
x = (4^(1/2)-14)/(1*2) or x = (-4^(1/2)-14)/(1*2)
x = -6 or x = -8
(x+8)*(x+6) = 0
((x-8)*(x+8)*(x+6))/(x+8) = 0
( x+6 )
x+6 = 0 // - 6
x = -6
( x+8 )
x+8 = 0 // - 8
x = -8
( x-8 )
x-8 = 0 // + 8
x = 8
x in { -8}
x in { 8}
x = -6
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