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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)
(5*y)/(y^2)-(7*y)-((4/2)*y)+9/y+14 = 0
(5*y)/(y^2)-7*y-2*y+9/y+14 = 0
14*y^-1-9*y^1+14*y^0 = 0
(14*y^1-9*y^2+14*y^0)/(y^1) = 0 // * y^2
y^1*(14*y^1-9*y^2+14*y^0) = 0
y^1
14*y-9*y^2+14 = 0
14*y-9*y^2+14 = 0
DELTA = 14^2-(-9*4*14)
DELTA = 700
DELTA > 0
y = (700^(1/2)-14)/(-9*2) or y = (-700^(1/2)-14)/(-9*2)
y = (10*7^(1/2)-14)/(-18) or y = (-10*7^(1/2)-14)/(-18)
y in { (10*7^(1/2)-14)/(-18), (-10*7^(1/2)-14)/(-18)}
y in { (10*7^(1/2)-14)/(-18), (-10*7^(1/2)-14)/(-18) }
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