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f(-1) = 0
f(-1) = p + 3 - 1 - 1 - 3 = 0
<=> p = 2
⇔ p(-1)^4 - 3(-1)^3 - (-1)^2 + (-1) - 3
⇔ p + 3 - 1 - 4
⇔ p - 2
⇔ p = 2