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25 November, 23:41

Consider polynomial function f (x) = (x + 1) (x-2) (x-3).

(a) Find all zeros.

(b) The zeroes divide R into a few open intervals. Find sign of f (x) for x in each

interval.

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Answers (1)
  1. 26 November, 00:06
    0
    A) f (x) = 0 x = - 1 or x = 2 or x = 3;

    b) x∈ (-oo, - 1) = > f (x) < 0;

    x∈ (-1, 2) = > f (x) > 0;

    x∈ (2, 3) = > f (x) < 0;

    x∈ (3, + oo) = > f (x) > 0;
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