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D( a )
a^2 = 0
a^2 = 0
a^2 = 0
1*a^2 = 0 // : 1
a^2 = 0
a = 0
a in (-oo:0) U (0:+oo)
(12*a)/(a^2)-(3*a)-10 = 0
(12*a)/(a^2)-3*a-10 = 0
12*a^-1-3*a^1-10*a^0 = 0
(12*a^0-3*a^2-10*a^1)/(a^1) = 0 // * a^2
a^1*(12*a^0-3*a^2-10*a^1) = 0
a^1
12-3*a^2-10*a = 0
12-3*a^2-10*a = 0
DELTA = (-10)^2-(-3*4*12)
DELTA = 244
DELTA > 0
a = (244^(1/2)+10)/(-3*2) or a = (10-244^(1/2))/(-3*2)
a = (2*61^(1/2)+10)/(-6) or a = (10-2*61^(1/2))/(-6)
a in { (2*61^(1/2)+10)/(-6), (10-2*61^(1/2))/(-6)}
a in { (2*61^(1/2)+10)/(-6), (10-2*61^(1/2))/(-6) }
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