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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
8/a+5 = 5*a-(2/a)-(4/a)-5+5 // - 5*a-(2/a)-(4/a)-5+5
8/a-(5*a)+2/a+4/a-5+5+5 = 0
8/a-5*a+2/a+4/a-5+5+5 = 0
14*a^-1-5*a^1+5*a^0 = 0
(5*a^1-5*a^2+14*a^0)/(a^1) = 0 // * a^2
a^1*(5*a^1-5*a^2+14*a^0) = 0
a^1
5*a-5*a^2+14 = 0
5*a-5*a^2+14 = 0
DELTA = 5^2-(-5*4*14)
DELTA = 305
DELTA > 0
a = (305^(1/2)-5)/(-5*2) or a = (-305^(1/2)-5)/(-5*2)
a = (305^(1/2)-5)/(-10) or a = (305^(1/2)+5)/10
a in { (305^(1/2)-5)/(-10), (305^(1/2)+5)/10}
a in { (305^(1/2)-5)/(-10), (305^(1/2)+5)/10 }
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