1) (1+х)(1-х)(1+х²)=(1-х²)(1+х²)=1-х²+х²-х в 4 степени=1-х в 4 степени!
2) 5х²-3(х+1)(х-1)=5х²-3(х²-1)=5х²-3х²-3=2х²-3!
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Answers & Comments
1) (1+х)(1-х)(1+х²)=(1-х²)(1+х²)=1-х²+х²-х в 4 степени=1-х в 4 степени!
2) 5х²-3(х+1)(х-1)=5х²-3(х²-1)=5х²-3х²-3=2х²-3!