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20 April, 13:11

5) Is 3 a zero (or root) of f (x) = x3 - 9x2 + 11x + 21?

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  1. 20 April, 16:14
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    Yes

    Step-by-step explanation:

    f (x) = x³ - 9x² + 11x + 21

    f (3) = (3) ³ - 9 (3) ² + 11 (3) + 21

    f (3) = 27 - 81 + 33 + 21

    f (3) = 0
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