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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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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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