Question

solve any 4
and give me the right answers ​

Answer 1

Answer:

Step-by-step explanation:

1) x²-y²-2x+2y

=(x+y)(x-y)-2(x-y)

=(x-y)(x+y-22)

2) -a²+2a+3

=-a²+3a-a+3

=-a(a-3)-(a-3)

=(a-3)(-a-1)

=-(a-3)(a+1)

3) a²-b²-c²+2bc

=a²-(b²+c²-2bc)

=a²-(b-c)²

=(a+b-c)(a-b+c)

4) ac+bc+a+b

=c(a+b)+a+b

=(a+b)(c+1)