- #1

alancj

- 58

- 0

"State the possible number of imaginary zeros of g(x)=x^4+3x^3+7x^2-6x-13."

(A) 3 or 1

(B) 2, 4, or 0

(C) Exactly 1

(D) Exactly 3

Using Descartes Rule of Sings I get:

Exactly 1 positive zero, 3 or 1 negative zeros, and 0 or 2 Imaginary zeros. They only want imaginary but I gave you the pos. and neg. because I used them to figure out the imaginary ones with a chart, like below.

|P_|_N_|_I_|

| 1 | 3 | 0 | 1+3+0=4

| 1 | 1 | 2 | 1+1+2=4

I've done similar questions given in my book and I've gotten them all right but for this question there is no option for what I found as you can see.

Am I right and the test question is just wrong? Did I do something wrong? I have gone over the book's example a thousand times and I don't see any other way.

Thanks,

Alan