Question

х(y-z)-(-y+z)
2b(x-y)-(y-x)
5(c-b)-(ab-ac)
2(x-c)-(-bx+bc)

Answer 1

х(y-z)-(-y+z)=х(y-z)+(y-z)=(y-z)(x+1)
2b(x-y)-(y-x)=2b(x-y)+(x-y)=(x-y)(2b+1)
5(c-b)-(ab-ac)=5(c-b)+a(c-b)=(c-b)(5+a)
2(x-c)-(-bx+bc)=2(x-c)+b(x-c)=(x-c)(2+b)