If $f(x)=x^7-3x^4+2x^3-k=0$, $k>0$
So putting x=-x in the equation, I am getting two sign changes. However, the problem in my book says three. Also, will the answer depend on the little condition given, ($k>0$)?
2026-04-13 13:47:48.1776088068
Doubt on Descartes rule
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