p4-7p2+1=p^4-7p²+1=p^4+2p²-2p²-7p²+1=p^4+2p²+1-9p²=(p²+1)²-(3p)²=(p²+1+3p)(p²+1-3p) =(p²+3p+1)(p²-3p+1) x4+4x2+3x+4 =x^4+4x²+3x+4=...