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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
a-(1/4) = 8/a+3 // - 8/a+3
a-(8/a)-(1/4)-3 = 0
a-8*a^-1-1/4-3 = 0
1*a^1-8*a^-1-13/4*a^0 = 0
(1*a^2-13/4*a^1-8*a^0)/(a^1) = 0 // * a^2
a^1*(1*a^2-13/4*a^1-8*a^0) = 0
a^1
a^2+(-13/4)*a-8 = 0
a^2+(-13/4)*a-8 = 0
DELTA = (-13/4)^2-(-8*1*4)
DELTA = 681/16
DELTA > 0
a = ((681/16)^(1/2)-(-13/4))/(1*2) or a = (-(-13/4)-(681/16)^(1/2))/(1*2)
a = ((681/16)^(1/2)+13/4)/2 or a = (13/4-(681/16)^(1/2))/2
a in { (13/4-(681/16)^(1/2))/2, ((681/16)^(1/2)+13/4)/2}
a in { (13/4-(681/16)^(1/2))/2, ((681/16)^(1/2)+13/4)/2 }
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