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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
1/a = (8/7)*a-(1/14) // - (8/7)*a-(1/14)
1/a-((8/7)*a)+1/14 = 0
(-8/7)*a+1/a+1/14 = 0
1*a^-1-8/7*a^1+1/14*a^0 = 0
(1/14*a^1-8/7*a^2+1*a^0)/(a^1) = 0 // * a^2
a^1*(1/14*a^1-8/7*a^2+1*a^0) = 0
a^1
(-8/7)*a^2+(1/14)*a+1 = 0
(-8/7)*a^2+(1/14)*a+1 = 0
DELTA = (1/14)^2-(1*4*(-8/7))
DELTA = 897/196
DELTA > 0
a = ((897/196)^(1/2)-(1/14))/(2*(-8/7)) or a = (-(1/14)-(897/196)^(1/2))/(2*(-8/7))
a = -7/16*((897/196)^(1/2)-1/14) or a = 7/16*((897/196)^(1/2)+1/14)
a in { -7/16*((897/196)^(1/2)-1/14), 7/16*((897/196)^(1/2)+1/14)}
a in { -7/16*((897/196)^(1/2)-1/14), 7/16*((897/196)^(1/2)+1/14) }
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