Local extrema of the function \(\displaystyle{f{{\left({x}\right)}}}={x}^{{3}}-{3}α{x}^{{2}}+{3}{\left(α^{{2}}-{1}\right)}{x}+{1}\)

Alfredo Holmes

Alfredo Holmes

Answered question

2022-03-24

Local extrema of the function f(x)=x33αx2+3(α21)x+1

Answer & Explanation

sa3b4or9i9

sa3b4or9i9

Beginner2022-03-25Added 14 answers

Note that

 f'(x)=3x26αx+3(α21) =3[x22ax+(a+1)(a1)] =3[x(a+1)][x(a1)]=0
which leads to the roots x=a±1. Then, solve 2<a±1<4 to obtain a(1,3).

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