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x in (-oo:+oo)
((x-4)^2)/5 = 4 // - 4
((x-4)^2)/5-4 = 0
((x-4)^2)/5+(-4*5)/5 = 0
(x-4)^2-4*5 = 0
x^2-8*x-4 = 0
x^2-8*x-4 = 0
x^2-8*x-4 = 0
DELTA = (-8)^2-(-4*1*4)
DELTA = 80
DELTA > 0
x = (80^(1/2)+8)/(1*2) or x = (8-80^(1/2))/(1*2)
x = (4*5^(1/2)+8)/2 or x = (8-4*5^(1/2))/2
(x-((8-4*5^(1/2))/2))*(x-((4*5^(1/2)+8)/2)) = 0
((x-((8-4*5^(1/2))/2))*(x-((4*5^(1/2)+8)/2)))/5 = 0
((x-((8-4*5^(1/2))/2))*(x-((4*5^(1/2)+8)/2)))/5 = 0 // * 5
(x-((8-4*5^(1/2))/2))*(x-((4*5^(1/2)+8)/2)) = 0
( x-((4*5^(1/2)+8)/2) )
x-((4*5^(1/2)+8)/2) = 0 // + (4*5^(1/2)+8)/2
x = (4*5^(1/2)+8)/2
( x-((8-4*5^(1/2))/2) )
x-((8-4*5^(1/2))/2) = 0 // + (8-4*5^(1/2))/2
x = (8-4*5^(1/2))/2
x in { (4*5^(1/2)+8)/2, (8-4*5^(1/2))/2 }
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