Question

因式分解 1)(5-x)^2+6(x-5)+9 2)(b-a)^2-6a(a-b)+9a^2

Answer 1

(5-x)^2+6(x-5)+9=(x-5+3)^2=(x-2)^2

2)(b-a)^2-6a(a-b)+9a^2=(a-b+3a)^2=(2a-b)^2