I need to find when 2x^3+x-5 is equal to zero and I'm stuck
You sure you have the right problem?
There is a really nice theorem for finding all of the rational zeroes of a polynomial that involves the first and last terms of the polynomial, have you seen it yet?
Hurkyls method show that there are no rational solutions. That means that this cannot be factored with integer coefficients. There is a "cubic formula" but it is very messy. It is probably best solved numerically.
(The method I used was to graph it on my calculator, then "zoom" in on the x-intercept!)
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