问题
填空题
分解因式x3+3x2-4x-12______.
答案
x3+3x2-4x-12,
=x3-4x+3x2-12,
=x(x2-4)+3(x2-4),
=(x2-4)(x+3),
=(x+2)(x-2)(x+3).
分解因式x3+3x2-4x-12______.
x3+3x2-4x-12,
=x3-4x+3x2-12,
=x(x2-4)+3(x2-4),
=(x2-4)(x+3),
=(x+2)(x-2)(x+3).