High School

Use Descartes's rule of signs to determine the possible numbers of positive real zeros of [tex] f = 9x^4 - 82x^2 + 9 [/tex].

Answer :

The signs are +-+. There are two sign changes: +- and -+, so Descarte's rule of signs tells you there are 0 or 2 positive real roots.

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A graph tells you there are 2 positive and 2 negative real roots.

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