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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)
(20/(x-4))^2+8*(20/(x-4))+16 = 0
(20^2)/((x-4)^2)+(8*20)/(x-4)+16 = 0
(20^2)/((x-4)^2)+(8*20*(x-4))/((x-4)^2)+(16*(x-4)^2)/((x-4)^2) = 0
8*20*(x-4)+16*(x-4)^2+400 = 0
16*x^2+160*x-128*x-240+256 = 0
16*x^2+32*x+16 = 0
16*x^2+32*x+16 = 0
16*(x^2+2*x+1) = 0
x^2+2*x+1 = 0
DELTA = 2^2-(1*1*4)
DELTA = 0
x = -2/(1*2)
x = -1 or x = -1
16*(x+1)^2 = 0
(16*(x+1)^2)/((x-4)^2) = 0
(16*(x+1)^2)/((x-4)^2) = 0 // * (x-4)^2
16*(x+1)^2 = 0
x+1 = 0 // - 1
x = -1
x in { -1, -1 }
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