Question

分解因式(x-1)²-49 9(a-b)²-30(a-b)+25 -3ax²+6axy-3

Answer 1

1.（x-1-7)(x-1+7)=(x-8)(x+6）

2.（3（a-b))^2-30(a-b)+5^2

=[3(a-b)-5]^2

3.(-3ax+3ay)(x-y)