$$P-2=(-2-2)((-2)^{2}+1)$$
$P=-18$
$$P-2=-4\left(\left(-2\right)^{2}+1\right)$$
$$P-2=-4\left(4+1\right)$$
$$P-2=-4\times 5$$
$$P-2=-20$$
$$P=-20+2$$
$$P=-18$$
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