The roots of the equation \[{{x}^{4}}-8{{x}^{2}}-9=0\] are

1.	The roots of the equation \[{{x}^{4}}-8{{x}^{2}}-9=0\] are
A.	\[\pm 3,\ \pm 1\]
B.	\[\pm 3,\ \pm i\]
C.	\[\pm 2,\ \pm i\]
D.	None of these
Answer» C. \[\pm 2,\ \pm i\]

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The roots of the equation \[{{x}^{4}}-8{{x}^{2}}-9=0\] are

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