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D( a )
a^2 = 0
a = 0
a^2 = 0
a^2 = 0
1*a^2 = 0 // : 1
a^2 = 0
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
10/(a^2)-(1/a)-2 = 0
10/(a^2)-a^-1-2 = 0
10*a^-2-a^-1-2 = 0
t_1 = a^-1
10*t_1^2-1*t_1^1-2 = 0
10*t_1^2-t_1-2 = 0
DELTA = (-1)^2-(-2*4*10)
DELTA = 81
DELTA > 0
t_1 = (81^(1/2)+1)/(2*10) or t_1 = (1-81^(1/2))/(2*10)
t_1 = 1/2 or t_1 = -2/5
t_1 = -2/5
a^-1+2/5 = 0
1*a^-1 = -2/5 // : 1
a^-1 = -2/5
-1 < 0
1/(a^1) = -2/5 // * a^1
1 = -2/5*a^1 // : -2/5
-5/2 = a^1
a = -5/2
t_1 = 1/2
a^-1-1/2 = 0
1*a^-1 = 1/2 // : 1
a^-1 = 1/2
-1 < 0
1/(a^1) = 1/2 // * a^1
1 = 1/2*a^1 // : 1/2
2 = a^1
a = 2
a in { -5/2, 2 }
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