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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)
1-(8000/(a^2)) = 0
1-8000*a^-2 = 0
-8000*a^-2 = -1 // : -8000
a^-2 = 1/8000
-2 < 0
1/(a^2) = 1/8000 // * a^2
1 = 1/8000*a^2 // : 1/8000
8000 = a^2
a^2 = 8000 // ^ 1/2
abs(a) = 40*5^(1/2)
a = 40*5^(1/2) or a = -(40*5^(1/2))
a in { 40*5^(1/2), -(40*5^(1/2)) }
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