(a) list the possible rational zeros of f, (b) sketch the graph of f so that some...

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(a) list the possible rational zeros of f,
(b) sketch the graph of f so that some of the possible zeros in part (a) can be disregarded, and then
(c) determine all real zeros of f.
1. f (x) = x3 + x2 − 4x - 4
2. f (x) = −3x3 + 20x2 − 36x + 16
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