1) = (-2)(a^2 - 4ab + b^2) = (-2)(a+b)^2
2)=(b-3)(b+3)((b+3)(b-3)+3(b-3))= (b-3)(b+3)((b+3)+3)=((b^2)-9)(b+6) подставляем b=-2 (4-9)(-2+6)=-5*4= -20
3)= ((y-3)+49)(y-3-4y)=(5y-3)(-3-3y)=(-3)(1+y)(5y-3)
4) =(x^2 - y^2)-(y+x) = (x-y)(x+y)-(y+x)= (x+y)(x-y-1)
1) = (-2)(a^2 - 4ab + b^2) = (-2)(a+b)^2
2)=(b-3)(b+3)((b+3)(b-3)+3(b-3))= (b-3)(b+3)((b+3)+3)=((b^2)-9)(b+6) подставляем b=-2 (4-9)(-2+6)=-5*4= -20
3)= ((y-3)+49)(y-3-4y)=(5y-3)(-3-3y)=(-3)(1+y)(5y-3)
4) =(x^2 - y^2)-(y+x) = (x-y)(x+y)-(y+x)= (x+y)(x-y-1)