[微積] 二次微分
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 )
請問這樣算正確嗎？
謝謝
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