standard_description: Relate the domain of a function to its graph and, where applicable, to the quantitative relationship it describes.  For example, if the function h(n) gives the number of person-hours it takes to assemble n engines in a factory, then the positive integers would be an appropriate domain for the function.
problem_activity: Find all of the roots of the following quartic equation:
$${h(x)=x^4-2x^3-9x^2-18x}$$


aligns: no