Find all of the zeros of each function. 9. f(x) = x3 + 9x2 + 6x - 16 10. f(x) = x + 7x2 + 4x + 28 11. f(x) = x4- 2r3 - 8x2 - 32x- 384 12. f(x) = x* - 6x3 + 9x2 + 6x – 10

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