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That factors to (x + 3)(x^2 - 3x + 7)

Setting those equal to zero leaves one real root (-3) and one complex root: one half times (three minus i times the square root of 19) where i is the square root of negative one.

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Q: How do you find zeros of the function f(x) x3 - 2x 21?
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The expression in the question "y -2x" is not a function.


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