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

Q1:

Using Descartesβs rule of signs, find which of the following describes the possible real zeros of β ( π₯ ) = 3 π₯ + 2 π₯ β 3 π₯ + π₯ + 6 π₯ + 2 5 4 3 2 .

Q2:

Using Descartesβs rule of signs, find which of the following describes the possible real zeros of π ( π₯ ) = β 6 π₯ + 3 π₯ + 7 π₯ β 1 3 2 .

Q3:

Using Descartesβs rule of signs, find which of the following describes the possible real zeros of π ( π₯ ) = β π₯ β 3 π₯ + 4 π₯ + 9 π₯ β 4 4 3 2 .

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