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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
6/a-12 = (12/3)*a // - (12/3)*a
6/a-((12/3)*a)-12 = 0
6/a-4*a-12 = 0
6*a^-1-4*a^1-12*a^0 = 0
(6*a^0-4*a^2-12*a^1)/(a^1) = 0 // * a^2
a^1*(6*a^0-4*a^2-12*a^1) = 0
a^1
6-4*a^2-12*a = 0
6-4*a^2-12*a = 0
DELTA = (-12)^2-(-4*4*6)
DELTA = 240
DELTA > 0
a = (240^(1/2)+12)/(-4*2) or a = (12-240^(1/2))/(-4*2)
a = (4*15^(1/2)+12)/(-8) or a = (12-4*15^(1/2))/(-8)
a in { (4*15^(1/2)+12)/(-8), (12-4*15^(1/2))/(-8)}
a in { (4*15^(1/2)+12)/(-8), (12-4*15^(1/2))/(-8) }
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