1) (2p+5)²-25=(2p+5-5)(2p+5+5)=2p(2p+10)
2) x^6+y^2 не возможно разложить на множители
3)(p+3)³-27= (P+3)³-3³=(p+3-3)((p-3)²+3(p+3)+3²=p(p²-6p+9+3p+9+9)=
=p(p²-3p27)
4) (a+1)^4-(a-1)^4= ((a+1)²-(a-1)²)((a+1)²+(a-1)²)=(a²+2a+1-a²+2a-1)*
*(a²+2a+1+a²-2a+1)=4a(2a²+2)=4a*2(a²+1)=8a(a²+1)