x的4次方-6x-7 因式分解 很急啊····
问题描述:
x的4次方-6x-7 因式分解 很急啊····
答
x4-1-6x-6=(x2+1)(x2-1)-6(x+1)=(x2+1)(x-1)(x+1)-6(x+1)=((x2+1)(x-1)-6)(x+1)=(x+1)(x3-x2+x-7)
x的4次方-6x-7 因式分解 很急啊····
x4-1-6x-6=(x2+1)(x2-1)-6(x+1)=(x2+1)(x-1)(x+1)-6(x+1)=((x2+1)(x-1)-6)(x+1)=(x+1)(x3-x2+x-7)