Question

Даю 50 балов!!!!!!



$4x^{2} - 4xy + y^{2}-9$

$ac^{4} - c^{4} - ac^{2} + c^{2}$

Answer 1

 $1)4x^2-4xy+y^2-9=(2x-y)^2-9=(2x-y-3)\cdot(2x-y+3)\\2)ac^4-c^4-ac^2+c^2=c^2\cdot(ac^2-c^2-a+1)=c^2\cdot(c^2\cdot(a-1)-(a-1))=c^2\cdot(a-1)\cdot(c^2-1)=c^2\cdot(a-1)\cdot(c-1)\cdot(c+1)$