Use Descartes' Rule of Signs to Determine the Possible Number

question 246

Multiple Choice

Use Descartes' Rule of Signs to determine the possible number of positive real zeros and the possible number of negative real zeros for the function.
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f ( x ) = - 2 x ^ { 4 } + 9 x ^ { 3 } - 7 x ^ { 2 } + 9 x - 7

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Definitions:

Covalent Bonds

Atomic bonds created through the mutual sharing of pairs of electrons among atoms.

VSEPR

A model used in chemistry to predict the geometry of individual molecules from the number of electron pairs surrounding their central atoms.

Lewis Structures

Diagrammatic methods for representing the bonds between atoms in a molecule and the lone pairs of electrons that may exist.

Elemental Symbol

A one or two-letter abbreviation derived from the element's English or Latin name used to represent an element in chemical formulas.