Question

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

Answer 1

\[5x^3+x^2-7x+28=0\]

Answer 2

There is not much to do here, but use the cubic formula.
And the cubic formula is usually in the form, which I am guessing you have learned or you wouldn't have this equation. But after you use the cubic formula you should get -2.114532

Answer 3

as it is a cubic polynomial so possible solutions are 3