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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
327*a-(4/a)+5 = 0
327*a-4*a^-1+5 = 0
327*a^1-4*a^-1+5*a^0 = 0
(327*a^2+5*a^1-4*a^0)/(a^1) = 0 // * a^2
a^1*(327*a^2+5*a^1-4*a^0) = 0
a^1
327*a^2+5*a-4 = 0
327*a^2+5*a-4 = 0
DELTA = 5^2-(-4*4*327)
DELTA = 5257
DELTA > 0
a = (5257^(1/2)-5)/(2*327) or a = (-5257^(1/2)-5)/(2*327)
a = (5257^(1/2)-5)/654 or a = (-(5257^(1/2)+5))/654
a in { (-(5257^(1/2)+5))/654, (5257^(1/2)-5)/654}
a in { (-(5257^(1/2)+5))/654, (5257^(1/2)-5)/654 }
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