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16 June, 18:34

Is (x + 7) a factor of f (x) = x3 - 3x2 + 2x - 8? Use either the remainder theorem or the factor theorem to explain your reasoning

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  1. 16 June, 18:45
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    Step-by-step explanation:

    If x + 7 is a factor of f (x), then f (-7) = 0.

    f (-7) = (-7) ³ - 3 (-7) ² + 2 (-7) - 8

    f (-7) = - 343 - 147 - 14 - 8

    f (-7) = - 512

    x + 7 is not a factor of f (x).
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