Question

因式分解a的平方(x-y)的平方-2a(y-x)的三次方+(x-y)的四次方

Answer 1

原式=a²(x-y)²+2a(x-y)³+(x-y)^4

=(x-y)²[a²+2a(x-y)+(x-y)²]

=(x-y)²[a+(x-y)]²

=(x-y)²(a+x-y)²