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D( y )
y^2 = 0
y^2 = 0
y^2 = 0
1*y^2 = 0 // : 1
y^2 = 0
y = 0
y in (-oo:0) U (0:+oo)
y^2-(7*y)+7*y+10/(y^2)-18 = 0
y^2-7*y+7*y+10/(y^2)-18 = 0
y^2+10*y^-2-18 = 0
t_1 = y^2
1*t_1^1+10*t_1^-1-18 = 0
1*t_1^1+10*t_1^-1-18*t_1^0 = 0
(1*t_1^2-18*t_1^1+10*t_1^0)/(t_1^1) = 0 // * t_1^2
t_1^1*(1*t_1^2-18*t_1^1+10*t_1^0) = 0
t_1^1
t_1^2-18*t_1+10 = 0
t_1^2-18*t_1+10 = 0
DELTA = (-18)^2-(1*4*10)
DELTA = 284
DELTA > 0
t_1 = (284^(1/2)+18)/(1*2) or t_1 = (18-284^(1/2))/(1*2)
t_1 = (2*71^(1/2)+18)/2 or t_1 = (18-2*71^(1/2))/2
t_1 in { (18-2*71^(1/2))/2, (2*71^(1/2)+18)/2}
t_1 = (18-2*71^(1/2))/2
y^2-((18-2*71^(1/2))/2) = 0
1*y^2 = (18-2*71^(1/2))/2 // : 1
y^2 = (18-2*71^(1/2))/2
y^2 = (18-2*71^(1/2))/2 // ^ 1/2
abs(y) = ((18-2*71^(1/2))^(1/2))/(2^(1/2))
y = ((18-2*71^(1/2))^(1/2))/(2^(1/2)) or y = -(((18-2*71^(1/2))^(1/2))/(2^(1/2)))
t_1 = (2*71^(1/2)+18)/2
y^2-((2*71^(1/2)+18)/2) = 0
1*y^2 = (2*71^(1/2)+18)/2 // : 1
y^2 = (2*71^(1/2)+18)/2
y^2 = (2*71^(1/2)+18)/2 // ^ 1/2
abs(y) = ((2*71^(1/2)+18)^(1/2))/(2^(1/2))
y = ((2*71^(1/2)+18)^(1/2))/(2^(1/2)) or y = -(((2*71^(1/2)+18)^(1/2))/(2^(1/2)))
y in { ((18-2*71^(1/2))^(1/2))/(2^(1/2)), -(((18-2*71^(1/2))^(1/2))/(2^(1/2))), ((2*71^(1/2)+18)^(1/2))/(2^(1/2)), -(((2*71^(1/2)+18)^(1/2))/(2^(1/2))) }
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