Determine the number of positive real, negative real, and imaginary zeros for the function
f(x)= x^4 - x^2 - 6
f(x)= x4 - x2 – 6
= x4 -3 x2 +2 x2
x2 =3 or x2 = -2
x = ±√3 or x = ± i √2
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