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DeadShot
 3 years ago
What are the possible number of positive, negative, and complex zeros of f(x) = 3x^4  5x^3  x^2  8x + 4 ?
DeadShot
 3 years ago
What are the possible number of positive, negative, and complex zeros of f(x) = 3x^4  5x^3  x^2  8x + 4 ?

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.Sam.
 3 years ago
Best ResponseYou've already chosen the best response.1Well, if they just want the number of roots, then it will be a total of 4 , 2 complex, 2 reals

Deadshot
 3 years ago
Best ResponseYou've already chosen the best response.0My teacher wants the possible number of positive real, negative real, and complex. Knowing that there are 2 complex zeroes narrows down the answer.

Deadshot
 3 years ago
Best ResponseYou've already chosen the best response.0Is the number of positive real 3 or 1 and the negative 1, or is it vice versa?

.Sam.
 3 years ago
Best ResponseYou've already chosen the best response.1Then apply Descartes' Rule, have you learn that before?

.Sam.
 3 years ago
Best ResponseYou've already chosen the best response.1I have to go now, there's a tutorial on that here: http://www.purplemath.com/modules/drofsign.htm Try it out :)
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