expand :
(-3z-4)^2
plz show your step, thx!
f2 identity
2012-08-30 6:59 am
回答 (2)
2012-08-30 8:30 am
✔ 最佳答案
(-3z-4)^2即(-3z-4)x(-3z-4)
=9z^2+24z+16
2012-08-30 7:29 am
why calling f2 identity\\
it is simple just mutiplying itself.
there are 2 item in the bracket, then multipying itself becoming 4 items.
2 items have the same order in z, then adding together, becoming 3 items. That's all.
it is simple just mutiplying itself.
there are 2 item in the bracket, then multipying itself becoming 4 items.
2 items have the same order in z, then adding together, becoming 3 items. That's all.
收錄日期: 2021-04-13 18:58:01
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20120829000051KK00941