Please help to solve this problem 1) a^2-b^2+4b-4

(a-b+2)x(a+b-2)

Step-by-step explanation:

1) factor out the negative sign from the expression: a^2(b^2-4b+4)

2) Using a^2-2ab+b^2=(a-b)^2, factor the expression: a^2-(b-2)^2

3) Using a^2-b^2=(a-b)(a+b), factor the expression: (a-(b-2))x(a+(b-2))

4) When there is a - in front of an expression in parentheses, change the. Sign of each term in the expression: (a-b+2)x(a+(b-2))

5) When there is a + in front of an expression in parentheses, the expression stays the same: (a-b+2)x(a+b-2)