Use Descartes' Rule of Signs to Determine the Possible Number $f ( x ) = 2 x ^ { 3 } - 2 x ^ { 2 } + 3 x - 4$

question 17

Multiple Choice

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

• A)3 positive reals or 1 positive real;3 negative reals or 1 negative real
• B)3 positive reals or 1 positive real;no negative reals
• C)1 positive real;3 negative reals or 1 negative real
• D)3 positive reals or 1 positive real;1 negative real
• E)no positive reals;no negative reals

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Definitions:

Fuzzy Trace Theory

States that memory is best understood by considering two types of memory representations: (1) verbatim memory trace; and (2) fuzzy trace, or gist. According to this theory, older children’s better memory is attributed to the fuzzy traces created by extracting the gist of information.

Verbatim Memory Trace

The detailed and precise recall of exact details, such as words or images, from memory.

Grist

Material or ideas ready to be used or turned into something valuable.

Three-dimensional

Pertaining to or having length, width, and depth.