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D( y )
y = 0
y^2 = 0
y = 0
y = 0
y^2 = 0
y^2 = 0
1*y^2 = 0 // : 1
y^2 = 0
y = 0
y in (-oo:0) U (0:+oo)
(4*y)/(y^2)-(10*y)-(1/y)-3+21 = 0
(4*y)/(y^2)-10*y-y^-1-3+21 = 0
3*y^-1-10*y^1+18*y^0 = 0
(18*y^1-10*y^2+3*y^0)/(y^1) = 0 // * y^2
y^1*(18*y^1-10*y^2+3*y^0) = 0
y^1
18*y-10*y^2+3 = 0
18*y-10*y^2+3 = 0
DELTA = 18^2-(-10*3*4)
DELTA = 444
DELTA > 0
y = (444^(1/2)-18)/(-10*2) or y = (-444^(1/2)-18)/(-10*2)
y = (2*111^(1/2)-18)/(-20) or y = (-2*111^(1/2)-18)/(-20)
y in { (2*111^(1/2)-18)/(-20), (-2*111^(1/2)-18)/(-20)}
y in { (2*111^(1/2)-18)/(-20), (-2*111^(1/2)-18)/(-20) }
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