3 Answered Questions for the topic Descartes

03/13/19

#### Could 'cogito ergo sum' possibly be false?

I've heard it postulated by some people that *"we can't truly know anything"*. While that does seem to apply to the vast majority of things, I can't see how *'cogito ergo sum'* can possibly be...
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11/15/15

#### Use descartes rule of signs to determine the possible number of positive real zeros and the possible number of negative real zeros for the following function: f

Use descartes rule of signs to determine the possible number of positive real zeros and the possible number of negative real zeros for the following function:
f(x)= 9x^7 + 3x^5 - 8x^3 + 7x -1

Descartes Rule

02/01/14

#### Descartes rule of signs

By Descarte's rule of signsÂ
P(x)=x3-2x2-3x-3
has how many positive real zeros ?
has how many negative real zeros (enter the smaller number first)

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