Question

三道七年级水平的,关于因式分解的题目

Answer 1

1、x³-1＝(x-1)(x²+x+1)

2、（a²-b²）²-8(a²+b²)=(a+b)^2(a-b)^2-8(a^2+b^2)

=4(a-b)^2-8[4-2ab]

=4[4-4ab]-8[4-2ab]

=16-16ab-32+16ab

=16-32

=-16