difference between the polynomials I have a homework assignment that I do not know how to solve. I don't understand how to calculate $f(x)$ in this assignment.
$f(t)$ is the difference between the polynomials $2t^3-7t^2-4$ and $t^2-7t-3$.
Calculate $f(3)$. 
What should I do to calculate $f(t)$?
Thanks!

If difference isn't explicitly defined then you can follow this definition.
If $h(x)$ is difference of $f(x)$ and $g(x)$, then $h(x)= | f(x) - g(x) |$.
Modulus is taken whenever the difference function isn't stated explicitly.
