Let q(x) be the polynomial resulting from translating p(x) 3 units to the left on the x axis. Then q(x) = p(x+3) and p(3)=-2 implies q(0)=-2.
The possible roots of q(x) are then the signed factors of -2: -2, -1, 1, and 2. Reversing the translation then means that 1, 2, 4, and 5 are the possible roots of p(x).
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