How would you solve this equation? x^3 -15x + 15.
Since the degree of the leading term is 3, this is therefore a cubic, and not a quadratic, expression.
To solve (by which I assume you mean finding the zeroes), one would customarily use the methodology outlined in this article
. However, that methodology will fail due to the fact that this expression has no rational zeroes. Therefore, one would need to use numerical methods
to approximate the zeroes.