Question

分解因式　　X³-ax²-2ax+a²-1 过程要详细每一步都要清楚

Answer 1

x^3+ax^2+ax+a-1
= {x^3 - 1} + {ax^2+ax+a}
=(x-1)(x^2+x+1) + a(x^2+x+1)
=(x^2+x+1)(x+a-1)