In this lesson, we will learn how to use Descartes’ rule of signs to get all possible numbers of positive and negative real roots.

Q1:

Using Descartes’s rule of signs, find which of the following describes the possible real zeros of ℎ(𝑥)=3𝑥+2𝑥−3𝑥+𝑥+6𝑥+2.

Q2:

Using Descartes’s rule of signs, find which of the following describes the possible real zeros of 𝑓(𝑥)=−6𝑥+3𝑥+7𝑥−1.

Q3:

Using Descartes’s rule of signs, find which of the following describes the possible real zeros of 𝑔(𝑥)=−𝑥−3𝑥+4𝑥+9𝑥−4.

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