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Which of the following expresses the possible number of positive real solutions for the polynomial equation shown below? 5x^3+x^2-7x+28=0 A. One B. Zero C. Two

Which of the following expresses the possible number of positive real solutions for the polynomial equation shown below?

5x^3+x^2-7x+28=0

A. One

B. Zero

C. Two or zero

D. Three or one

I think it's two or zero but I have to be sure

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