What is the solution to x 4 – 12x 2 + 10 > 0?

Let y = x², so the inequality becomes y² − 12y + 10 > 0. The equation y² − 12y + 10 = 0 has roots y = 6 ± √26, approximately 0.90 and 11.10; taking square roots gives x-values of about ±0.95 and ±3.33. Since the quartic opens upward, it is positive outside its four roots, giving (−∞, −3.33) ∪ (−0.95, 0.95) ∪ (3.33, ∞), choice D.

AI-written and checked against the verified answer.