AIR MATH

Math Question

Pre-Test Active 1 2 3 What are the solutions of the equation \( x^{4}-9 x^{2}+8=0 \) ? Use \( u \) substitution to solve. \( x=1 \) and \( x=2 \sqrt{2} \) \( x=\pm 1 \) and \( x=\pm 2 \sqrt{2} \) \( x=\pm i \) and \( x=\pm 2 i \sqrt{2} \) \( x=\pm i \) and \( x=2 \sqrt{2} \)

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