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= (-p2 + 4p ) - ( 5p2 + p )
= -p2 + 4p - 5p2 - p
= -p2 -5p2 + 4p - p
= -6p2 + 3p
-p²+4p - 5p²-p=
-6p²+3p=
3p(1-2p)