(P² + P-5) (P² + P-4)=6
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(p²+p-5)(p²+p-4)=6
p⁴+p³-4p+p³+p²-4p-5p²-5p+20 = 6
p⁴+p³+p³+p²-5p²-4p-4p-5p = 6-20
p⁴+2p³-4p²-8p-5p = -14
p⁴+2p³-4p²-13p = -14
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