Question

分解因式1.(a-b)x^2+9(b-a) 2.(x-y)(x-y+2)+1 3.x^2+2x-8 4.(x^2+4)^

Answer 1

答：

1.原式

=(a-b)x^2-9(a-b)

=(a-b)(x^2-9)

=(a-b)(x+3)(x-3)

2.原式

=(x-y)^2+2(x-y)+1

=(x-y+1)^2

3.原式

=(x+4)(x-2)

4.原式

=(x^2+4+4x)(x^2+4-4x)

=(x+2)^2(x-2)^2