Are you trying to solve for x?
Fx = x2 - 3
x2 - Fx - 3 = 0
x2 - Fx = 3
x2 - Fx + (F/2)2 = 3 + (F/2)2
(x - F/2)2 = 3 + (F/2)2
x - F/2 = ±[ 3 + (F/2)2 ]1/2
x = F/2 ± [ 3 + (F/2)2 ]1/2
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The answer depends on what the question is!
-144
x=3
(x, y) = (-3, -3) or (3, 3)
There's an equals missing...