Question 67434
figure that p = x^2 for now:
(x^2)^2 + k(x^2) + 1 = 0
p^2 + kp + 1 = 0
p^2 + kp = -1
(p + k/2)^2 = -1 + k^2/4
p + k/2 = +- sqrt(k^2/4 - 1)
p = -k/2 +- sqrt(k^2/4 - 1)
x^2 = -k/2 +- sqrt(k^2/4 - 1)
x = +- sqrt(-k/2 +- sqrt(k^2/4 - 1))
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k^2 < 4
-2 < k < 2