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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
8/a-16 = (16/3)*a // - (16/3)*a
8/a-((16/3)*a)-16 = 0
(-16/3)*a+8/a-16 = 0
8*a^-1-16/3*a^1-16*a^0 = 0
(8*a^0-16/3*a^2-16*a^1)/(a^1) = 0 // * a^2
a^1*(8*a^0-16/3*a^2-16*a^1) = 0
a^1
(-16/3)*a^2-16*a+8 = 0
(-16/3)*a^2-16*a+8 = 0
DELTA = (-16)^2-(4*8*(-16/3))
DELTA = 1280/3
DELTA > 0
a = ((1280/3)^(1/2)+16)/(2*(-16/3)) or a = (16-(1280/3)^(1/2))/(2*(-16/3))
a = -3/32*((1280/3)^(1/2)+16) or a = -3/32*(16-(1280/3)^(1/2))
a in { -3/32*((1280/3)^(1/2)+16), -3/32*(16-(1280/3)^(1/2))}
a in { -3/32*((1280/3)^(1/2)+16), -3/32*(16-(1280/3)^(1/2)) }
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