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D( y )
2*y-2 = 0
2*y-2 = 0
2*y-2 = 0
2*y-2 = 0 // + 2
2*y = 2 // : 2
y = 2/2
y = 1
y in (-oo:1) U (1:+oo)
(8*y^2-(2*y)-7)/(2*y-2) = 0
(8*y^2-2*y-7)/(2*y-2) = 0
8*y^2-2*y-7 = 0
8*y^2-2*y-7 = 0
DELTA = (-2)^2-(-7*4*8)
DELTA = 228
DELTA > 0
y = (228^(1/2)+2)/(2*8) or y = (2-228^(1/2))/(2*8)
y = (2*57^(1/2)+2)/16 or y = (2-2*57^(1/2))/16
(y-((2-2*57^(1/2))/16))*(y-((2*57^(1/2)+2)/16)) = 0
((y-((2-2*57^(1/2))/16))*(y-((2*57^(1/2)+2)/16)))/(2*y-2) = 0
( y-((2*57^(1/2)+2)/16) )
y-((2*57^(1/2)+2)/16) = 0 // + (2*57^(1/2)+2)/16
y = (2*57^(1/2)+2)/16
( y-((2-2*57^(1/2))/16) )
y-((2-2*57^(1/2))/16) = 0 // + (2-2*57^(1/2))/16
y = (2-2*57^(1/2))/16
y in { (2*57^(1/2)+2)/16, (2-2*57^(1/2))/16 }
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