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y in (-oo:+oo)
y = (y^2-(8*y)+16)/4 // - (y^2-(8*y)+16)/4
y-((y^2-(8*y)+16)/4) = 0
y-((y^2-8*y+16)/4) = 0
(-1*(y^2-8*y+16))/4+y = 0
(-1*(y^2-8*y+16))/4+(4*y)/4 = 0
4*y-1*(y^2-8*y+16) = 0
12*y-y^2-16 = 0
12*y-y^2-16 = 0
12*y-y^2-16 = 0
DELTA = 12^2-(-16*(-1)*4)
DELTA = 80
DELTA > 0
y = (80^(1/2)-12)/(-1*2) or y = (-80^(1/2)-12)/(-1*2)
y = (4*5^(1/2)-12)/(-2) or y = (-4*5^(1/2)-12)/(-2)
(y-((4*5^(1/2)-12)/(-2)))*(y-((-4*5^(1/2)-12)/(-2))) = 0
((y-((4*5^(1/2)-12)/(-2)))*(y-((-4*5^(1/2)-12)/(-2))))/4 = 0
((y-((4*5^(1/2)-12)/(-2)))*(y-((-4*5^(1/2)-12)/(-2))))/4 = 0 // * 4
(y-((4*5^(1/2)-12)/(-2)))*(y-((-4*5^(1/2)-12)/(-2))) = 0
( y-((-4*5^(1/2)-12)/(-2)) )
y-((-4*5^(1/2)-12)/(-2)) = 0 // + (-4*5^(1/2)-12)/(-2)
y = (-4*5^(1/2)-12)/(-2)
( y-((4*5^(1/2)-12)/(-2)) )
y-((4*5^(1/2)-12)/(-2)) = 0 // + (4*5^(1/2)-12)/(-2)
y = (4*5^(1/2)-12)/(-2)
y in { (-4*5^(1/2)-12)/(-2), (4*5^(1/2)-12)/(-2) }
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