Question

Помогите разложить на множители
2, 3 и 4 задания

Answer 1

2
$1-(x^2-2xy+y^2)=1^2-(x-y)^2=[1-(x-y)]*[1+(x-y)]=$
$=(1-x+y)(1+x-y)$
3
$a^2-3^2(b^2-2bc+c^2)=[a]^2-[3(b-c))]^2=$
$=(a-3b+3c)*(a+3b-3c)$
4
$2(x^2-10xy+25y^2-1^2)=2[(x-5)^2-1^2]=$
$=2*[(x-5)-1]*[(x-5)+1]=2(x-6)(x-4)$