(急!)因式分解: -2q^4+2q^3+q^2-1

2009-09-29 1:25 am
因式分解: -2q^4+2q^3+q^2-1
要step. thanks ;)
更新1:

to hhhsesa: your answer is wrong. sorry : (

更新2:

螞蟻雄兵: 對不起: ( 你的答案也錯了.

更新3:

答案一定是 (q-1)(1+q-2q^3).

回答 (3)

2009-09-29 2:01 am
✔ 最佳答案


因式分解: -2q^4+2q^3+q^2-1
Sol
-2q^4+2q^3+q^2-1
=-2q^3(q-1)+(q^2-1)
=-2q^3(q-1)+(q-1)(q+1)
=(q-1)(-2q^3+q+1)
=(q-1)(-2q^3+2q^2-2q^2+2q-q+1)
=-(q-1)[2q^2(q-1)+2q(q-1)+(q-1)]
=-(q-1)(2q^2+2q+1)(q-1)
=-(q-1)^2(2q^2+2q+1)


2009-09-29 3:58 am
你提供的答案是未完成的,螞蟻雄兵的答案才是對的.
2009-09-29 2:25 am
-2q^4+2q^3+q^2-1

= -2q^3 (q-1) + (q-1) (q+1)

= (q-1) (-2q^3+q+1)

= (q-1)(1+q-2q^3)
參考: myself


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