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a in (-oo:+oo)
0 = a^2-(16/64) // - a^2-(16/64)
16/64-a^2+0 = 0
16/64-a^2 = 0
-1*a^2 = -1/4 // : -1
a^2 = 1/4
a^2 = 1/4 // ^ 1/2
abs(a) = 1/2
a = 1/2 or a = -1/2
a in { 1/2, -1/2 }
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