Question

因式分解：（步骤）4+12（x-y）+9（x-y）平方=谢谢

Answer 1

4+12（x-y）+9（x-y）^2

=[3(x-y)]^2+12(x-y)+2^2

=[3(x-y)+2]^2

=(3x-3y+2)^2