Solve the problem. f (x) = x 4 - 4x 2 - 221 a. Factor the polynomial over the set of real numbers. b. Factor the polynomial over the set of complex numbers. Select one: O a. a. f (x) = (x² + 17)(x² + 13) b. f (x) = (x – V17i)(x + V17i)(x + v13i)(x – V13i) O b. a. f (x) = (x – V17)(x + V17)(x² + 13) b. f (x) = (x – V17)(x + V17)(x + V13i)(x – V13i) O c.a. f (x) = (x – VI7)(x + V17)(x – VI3)(x + VT3i) b. f (x) = (x – V17)(x + V17)(x + V13)(x – V13) %3D O d. a. f (x) = (x – V13)(x + V13)(x² + 17) b. f (x) = (x – V13)(x + /13)(x + V17i)(x – V17i) %3D

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