Why f(8)=0?Cs we use a Thm, It is unknow for most people here.

来源: jinjing 于 2011-07-16 08:19:30 [档案] [旧帖] [给我悄悄话] 阅读数 : (493 bytes)

回答: Ms. Kang has explained, her explanation is not as clear as you d 由 15少于 2011-07-16 06:30:03

Thm can be verified by my method. Young man, I'm here for fun and health. I like your self-confidence and gusto....In fact,the Q is not good in strict Math, we should use...repeat root 5, Why?...,if not It is against Algebraic Fundamental Thm.

At last,I give the general answer...for 15less:

Only change 2 to d,5 to c,0 to t ,f(0) to f(t) in originnal Q.

f(t)=-(d/(d-c)^2)(t-d)(t-2c+d) if d<c

f(t)=-((2c-d)/(d-c)^2)(t-d)(t-2c+d) if d>c.

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