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a in (-oo:+oo)
1700 = (1/2)*a^(10^2) // - (1/2)*a^(10^2)
1700-((1/2)*a^(10^2)) = 0
(-1/2)*a^(10^2)+1700 = 0
-1/2*a^100 = -1700 // : -1/2
a^100 = 3400
a^100 = 3400 // ^ 1/100
abs(a) = 3400^(1/100)
a = 3400^(1/100) or a = -3400^(1/100)
a in { 3400^(1/100), -3400^(1/100) }
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