a⁴-2a³+a²-1=a⁴-a³-a³+a²-a²+a²+a-a-1=a²*(a²-a-1)-a*(a²-a-1)+a²-a-1=(a²-a-1)*(a²-a+1)
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a⁴-2a³+a²-1=a⁴-a³-a³+a²-a²+a²+a-a-1=a²*(a²-a-1)-a*(a²-a-1)+a²-a-1=(a²-a-1)*(a²-a+1)