作者dayeh (dayeh)
看板Math
标题[微积] 二次微分
时间Sun Feb 13 00:44:46 2011
Find the range of x where the fuction
f(x)=x^4-2x^3+x^2-2x+1 is concave?
我的算法
f''(x)=12x^2-12x+2=0
x=(3+√3)/6 and (3-√3)/6
concave upward (-∞, (3-√3)/6 ) and ( (3+√3)/6 ,∞)
concave downward ( (3+√3)/6 , (3-√3)/6 )
请问这样算正确吗？
谢谢
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1F：推 NoneNumen :你得到他了 02/13 00:54
2F：→ dayeh :数字真的那麽丑喔... 02/13 01:13
3F：→ josh28 :这个数字还算是漂亮了吧XD 02/13 01:46